Top 10 Best generator inlet box 30 amp 4 prong in 2026

Last Updated - 6/24/2026

🏆Best Choice

RVMATE

Pre-Drilling 30 Amp Generator Inlet Box RVMATE, NEMA L14-30P Power Inlet Box for 4 Prong Generator Cord, 125/250V,3750/7500W 30a Power Inlet Box, ETL Listed, Waterproof for Outdoor Use

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•🚩【Pre-drilling Design】: RVMATE 30Amp generator inlet box is easy to remove and replace the wiring caps without using special tools (such as driller/knockout punch) or finding an electrician . RVMATE pre-drilling generator inlet box saves your time and money.
•🚩【ETL Certification】: 125/250V, 3750/7500W, 30A generator power inlet box is designed for the use with the transfer switches or panels and generator-ready load centers. And It also is designed be installed outdoors in an open area where the generator is being used to avoid carbon monoxide hazard. ETL/cETL certified
•🚩【Safety Light Indication】: There is a clear LED power indicator on the flip cover. Compared with the old version, the green indicator lights up when the power is successfully connected, which provides the best performance and higher security（especially working at night or in dark areas).
•🚩【Enough Space】: The internal space of our power inlet box is 50% larger than that of the ordinary power inlet box. It provides generous wiring space. And the front of the box is removable for easy placing and wiring.
•🚩【Weatherproof & Anti-rust】: The power inlet box is constructed of steel with durable, anti-corrosive powder-coat paint. And when not working, the weatherproof flip cover can be closed to prevent moisture front entering the connector inlet.
•🚩【100% Satisfactory Service】: We provide 12 months after-sales service. If you have any questions, please contact us and we will be happy to assist you. PATENTED.

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$25.64

$26.99

-5%

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CircleCord

CircleCord 4 Prong 15 Feet 30 Amp Generator Extension Cord and Inlet Box with Locking Connector, Heavy Duty NEMA L14-30P/L14-30R, 125/250V 7500W 10 Gauge SJTW Generator to House Power Cord

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•ETL Listed: High quality standards. 10 gauge 4 prong SJTW 125/250V up to 7500W, NEMA L14-30P male to L14-30R female twist lock, ETL Listed
•Emergency Ready: This generator extension cord with inlet box provides a safe and convenient way to connect your generator to the manual transfer switch on your house, providing the power you need in bad weathers. Also for house building
•Pre Drilled: The 4 knockouts were replaced by rubber plugs which are easy to remove directly without damaging the power inlet box. Never need a special tool (such as driller/knockout punch) to drill. Easy to Open
•Heavy Duty: Pure copper wiring coated with a heavy duty flame retardant, heat resistant, UV resistant PVC, provides protection from rain, wind, snow, soil, and rocks for emergency ready
•Easy to Organize: Comes with a lovely storage bag and adjustable cord organizer that makes carrying and storing simple after use

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$52.69

$57.69

-9%

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CircleCord

CircleCord 30 Amp 4 Prong Generator Power Inlet Box, NEMA L14-30P Power Inlet Box for 4 Prong Generator Cord, 125/250 Volt, 7500 Watts, Weatherproof, Outdoor Use for Emergency Ready, ETL Listed

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•ETL Certified: 30 Amp, 125/250V, 7500W, NEAM L14-30 inlet generator plug, suit for all 30 amp NEMA L14-30 generator cord. Max wire Gauge:10 AWG. The best partner for the generator to the house power cord, ETL Certified
•Pre Drilled: The 4 knockouts were replaced by removable rubber plugs made it easy to remove directly without damaging the power inlet box. No more need for a special tool (such as a driller/knockout punch) to drill. Easy to Open
•Larger Space: Our power inlet box has 50% more internal space than an ordinary power inlet box. There is plenty of wiring space can make your wiring tidy. The front of the box is removable for easy placing and wiring
•Easy to Install: 1.2" hole drilling position on 4 areas: Left, Right, Bottom, and Back, easy to connect to transfer switch and electric panel. Also the newly designed 1.2" hole is easy to open, and the front panel is detachable for easy installation
•Green Light Indicator: The new upgraded version includes a power-on indicator. A clear green indicator on the flip cover will light up when the power connection is successful. It provides an obvious and clear indication, improving performance and increasing safety

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$26.49

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Kohree

Kohree 30 Amp Generator Power Inlet Box, NEMA L14-30P Power Inlet Box for 4 Prong Generator Cord, 125/250V, 7500W Weatherproof for Outdoor Generator Outlet Receptacle, ETL Listed

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•SAFETY CERTIFICATE: ETL Listed PB30 30amp NEMA 3R power inlet box 125/250V, 7500W, suitable for all 30amp 4 prong NEMA L14-30P generator and cord. The Best Partner for generators to house power cords, providing and maintaining continuous backup power supply from the generator outside, especially when insufficient power and bad weather such as tornadoes and blizzards.
•UPGRADE PRE-DRILLED DESIGN: No knockouts, no drilling required. The 30 amp generator inlet box features 4 pre-drilled 1.2" holes (Left, Right, Bottom & Back), each covered by a removable cover, which can be removed easily without damaging the generator box! Run the wiring to transfer the switch or electric panel.
•GREEN SAFE LIGHT INDICATOR: With a clear GREEN INDICATOR on the flip cover, you can easily verify the correct connection of power, "Green-On" means successful, added safety in the night or dark areas.
•3.1" LARGER ROOM: Makes your installation easier and faster, and the front of the power inlet box is removable for easy placement and wiring. Thus, the heat-dissipation is faster to ensure long service life.
•WEATHERPROOF & RUSTPROOF: Kohree enclosed 30 amp generator inlet box is constructed of rugged steel and covered with corrosion-resistant coating inside and out. The front lid can be closed securely when not in use to protect the connector from dust and moisture.
•QUALITY CUSTOMER-SERVICE: Kohree offers you a better shopping experience. If there is any problem, contact us at any time. Our customer experience team is always available to help you！

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$21.43

$26.79

-20%

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Rophor

Rophor 30 Amp Generator Power Inlet Box, NEMA L14-30P Power Inlet Box for 4 Prong Generator Cord, 125/250 Volt, 7500 Watts, Weatherproof, Outdoor Use, ETL Listed

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•Generator Power Inlet Box: Power inlet box is an outdoor/watertight electrical inlet for a 30 Amp L14-30 generator cord. 125/250V, 7500W. Max wire Gauge:10AWG. It is designed to be installed outdoors in an open area where the generator is being used and perfect for backup power during a power outage
•Safety Assurance: It is designed to be located outdoors where the generator is running to prevent dangerous carbon monoxide fumes from the generator from entering your house. This inlet box is then safely hardwired through an outside wall directly to the transfer switch or panel, eliminating the need for cords running through windows or doors. Our generator power inlet box passed the certifications of ETL
•Best Space Design & Easy to Install: Compared with ordinary boxes, we have increased the wiring space by 50%. There are generous wiring space and facilitates through-in. The front of the box is removable for easy placement and wiring
•Weatherproof & Anty-rust: The front entry inlet has a weatherproof spring cover which closes when not in use to protect the inlet from the elements. The surface of the power inlet box with anti-corrosive powder-coat paint which can resist weather damage like rain, UV, will not rust
•Green Light Indication: New upgraded version provide a Green Power Indicator. There will be on a green light on the flip lid when plugging into the generator cord and powering on the generator. It gives a visibly clear indication when it is working and inlet is ready to use, which provides optimum performance and added safety

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$26.99

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WELLUCK

WELLUCK 30 Amp Generator Inlet Box - NEMA L14-30P Power Inlet Box for 3R 4-Prong Generator Cord, 125/250V, 7500W Weatherproof Outdoor 30a Power Inlet Box - ETL Listed, Best Partner in Emergencies

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•Generator Power Inlet Box with ETL Listed: Power inlet box is an outdoor/watertight electrical inlet for all 30 Amp 4 Prong NEMA L14-30P generator cords.125V, 7500W. Max wire Gauge:10AWG. Our generator inlet box 30 amp kit is a good partner for the generator to accommodate the power cord. It is designed for outdoor installation where generators are used, making it perfect for backup power during outages or severe weather conditions.
•Best Space Design & Easy to Install: Compared to standard boxes, our 30 amp generator inlet box features a 50% increase in wiring space, enhancing user experience by eliminating issues caused by cramped conditions.Welluck 30 amp generator inlet box can be disassembled from the front, simplifying and speeding up installation. Additionally, it offers improved heat dissipation for a longer service life.
•Versatile Attachment & Unique Outlet Design: Four 1.2-inch drilled holes (left, right, down, and rear) enable direct connections to transfer switches and panels, reducing wire bending. The specialized outlet design with cable entry holes blocks debris, extending equipment life and ensuring a secure, safe generator setup.
•Large Cover & 3R Rainproof Enclosure: The metal body of the generator inlet box 30 amp kit is coated with an anti-rust finish, effectively resisting rain, storms, UV rays, and other weather-related damage. The large cover and increased capacity help keep out dust and moisture, ensuring stability. Made from galvanized steel with a 3R rainproof enclosure, it offers durability and rust resistance for long-lasting reliability.
•WELLUCK Committed Service: Our 30 amp generator inlet box is an upgraded model, meticulously designed after thorough research and testing to meet market needs. We are dedicated to delivering a superior user experience and ensuring the highest product quality. If you have any questions or need assistance, our customer support team is here to help, providing prompt and reliable service to ensure your complete satisfaction.

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$27.99

$32.99

-15%

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Veepeak

Veepeak 30 Amp Generator Inlet Box with Pre-Drilled Knockouts & NEMA L14-30P 4-Prong Twist Locking Generator Plug, Outdoor Weatherproof Heavy Duty Power Box, 125/250 Volts, ETL Listed

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•The Veepeak NEMA 3R power inlet box is an ideal and safe way when connecting electricity to your RV hook-up, or portable generator for reliable backup power. It is designed to connect a generator cord to a manual transfer switch or transfer panel, and to be installed outdoors in an open area where the generator is being used to avoid carbon monoxide hazard.
•ETL Listed Power Inlet Box: NEMA L14-30P 4 prong flanged twist locking inlet plug, rated for 30 ampere at 125/250 volt AC, max 7500 Watts, max wiring gauge: 10AWG, dimensions: 4.1” x 3.1” x 6”. ETL Listed (conforms to UL/CSA standard).
•Easy to Install: Generous wiring space and removable front face allow for easy and neat installation, plus better heat dissipation and longer lifespan. There are four pre-cutted knockouts for direct connection to multi-directional transfer switches and electrical panels. No more frustrating drilling needed, and no more bent wires.
•Heavy Duty & Weatherproof: The inlet box is constructed of steel with rugged, antirust coating which can effectively resist rain, UV and other elements. It also features a flip cap with waterproof foam to prevent moisture or dust from entering the inlet when not in use.
•Peace of Mind: it comes with a green led indicator light on the flip cover for working status, heavy-duty & weatherproof enclosure for added safety, plus Veepeak’s one-year hassle-free replacement warranty.

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$23.99

$25.99

-8%

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WILAWELS

WILAWELS 30 Amp Generator Power Inlet Box, NEMA L14-30P Inlet Box for 4-Prong Generator Cord, 125/250V 7500 W Pre-Drilled, Weatherproof Outdoor Plug Box for Christmas, Emergency, ETL Listed, H07OB06

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•30Amp Generator Inlet Box: The generator power inlet box features a NEMA L14-30P plug, with a rated voltage of 125/250V and a robust power output of up to 7,500 watts, ensuring a long-lasting and reliable power supply
•3R Enclosure: The 30 Amp generator inlet box made of 3R galvanized steel, provides a robust enclosure that withstands wind, rain, snow, and ice. Its excellent weather resistance makes it an ideal choice for emergency power during harsh weather conditions
•Safety Indicator Light: The L14-30 generator inlet box has an indicator light on the lid that turns on immediately upon power connection, providing instant visual feedback and enhancing safety by keeping you informed of the power status
•ETL Certified: Specifically designed for outdoor use, the outdoor weatherproof generator power inlet box is ETL certified, ensuring the safety and reliability of the product in outdoor and harsh weather conditions, and keeping you powered safely no matter the weather
•Easy Installation: The 30 Amp 4 prong generator inlet box comes with pre-drilled holes on all sides, avoiding the hassle of drilling holes yourself and the risk of damaging the box. The removable rubber plugs make wiring a breeze

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$19.99

$21.99

-9%

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Sigrupery

30 Amp Generator Inlet Box, NEMA L14-30P Power Inlet Box for 3R 4-Prong Generator Cord, 120/240V, 7200W Weatherproof Outdoor Generator Receptacle, Use for Emergency Ready

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•Weatherproof and Durable Enclosure: Crafted from galvanized steel, this enclosure meets NEMA 3R standards, with a strong protective coating that effectively resists wind, rain, and snow. Designed specifically for harsh outdoor environments. Additionally, the enclosure fully covers the plug, enhancing safety by preventing water and moisture from entering
•Bottom Hole Design: The bottom of the product has a reserved hole and a wire outlet hole, which is easy to remove and replace the wiring cap, and it can be easily unscrewed when in use, without tools. When not in use, it can be completely closed to avoid debris and dust from entering, to ensure that the equipment is clean
•More Internal Wiring Space: Compared with other similar products, our 30amp Generator Inlet Box has a larger internal space (wiring range 6-12AWG) for easy and organized wiring. The spacious design ensures better heat dissipation and improves the durability of the box for long-term use
•Ensures Safety: products meet strict safety standards for reliable power during power outages and extreme weather conditions. 50 Amp generator inlet box is compatible with all 30 Amp NEMA L14-30 generator cords and features a built-in grounding terminal for added safety
•Easy Installation: Our generator power inlet box has pre-drilled holes on the side, back and bottom for easy wiring, you can choose the right location according to your needs.Equipped with product instructions and recommended to be installed by a professional electrician

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$38.99

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HAYOHRT

HAYOHRT 30 Amp Generator Power Inlet Box Pre-Drilling NEMA L14-30P Inlet Box for 4-Prong Generator Cord, 125/250V 3750/7500W UL Listed Waterproof Outdoor Use

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•UL Listed: Power inlet box is an outdoor waterproof electrical inlet for all 30 amp 4 prong NEMA L14-30P generator power cords. 125/250V, 3750/7500W. Wire Gauge: 6-8AWG. 30 Amp inlet box is a great companion to your generator to accommodate the power cords. It is designed for outdoor installations using generators and is ideal as a backup power source during power outages or severe weather conditions.
•Expanded Space: 30-amp generator inlet box has 50% more wiring space than a standard box, enhancing the user experience by eliminating problems caused by cramped conditions. 30-amp power inlet box can be removed from the front, simplifying and speeding up installation.
•3R Rainproof Enclosure: Generator inlet box is made of steel with an anti-rust coating on the surface, which can effectively resist weather-related damage such as rain, storms, and UV rays, and is durable and rust-resistant. The large cover and increased capacity help prevent dust and moisture from entering, ensuring stability for lasting reliability.
•Multi-hole Design: Four 1-inch or 2-inch drilled holes (up, down, left, and right) can be directly connected to the transfer switch and panel, reducing wire bending. Dedicated socket design with cable entry holes blocks debris, extending equipment life and ensuring a safe and reliable generator setup.
•Safety Isolation: The inlet box can effectively isolate the generator from the external power supply, ensuring the safety of personnel when performing equipment maintenance or repairs. By disconnecting the inlet box, the generator can be completely disconnected from the power supply to avoid dangers such as accidental electric shock.

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$39.99

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