Top 10 Best 30 amp generator inlet box in 2026

Last Updated - 6/7/2026

🏆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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RVINGPRO

RVINGPRO 30 Amp Generator Cord 25FT and Power Inlet Box, Pre-Drilled 30 Amp Generator Inlet Box with Cord, NEMA L14-30P to L14-30R Generator Cord Waterproof Combo Kit, ETL Listed

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•Heavy Duty 30 Amp Generator Cord: RVINGPRO 30 amp generator cord is made of 100% copper conductor with flame retardant coating and PVC jacket. Length: 25FT; Voltage: 125V/250V; Wire Gauge: 10/4 SJTW; Male Plug: NEMA 14-30P; Female Plug: NEMA L14-30R, Twist Locking Connector; Max Wattage: 7,500 Watts.
•Pre-Drilled 30 Amp Generator Inlet Box: RVINGPRO NEMA L14-30P 30 amp inlet box for generator is designed with 4 pre-drilled holes distributing in 4 directions (left, right, bottom and rear), which allows direct connection to switches and electrical panels from multiple directions. NO Hassle Drilling Needed. You can easily open the hole with your fingers within only 30s. PATENTED.
•ETL Listed: Both of RVINGPRO 30 amp generator cord and power inlet box have passed ETL certification, which are safe enough for outdoor use. Our generator to house hookup kit can work well in various terrible weather conditions, no matter hurricanes or snowstorm, ensuring a stable and continuous power supply for power outage emergency.
•Use with Ease: There is a weatherproof seal cap on the inlet box which closes when not in use, protecting the inlet from rain and dust Besides, there is a green indicator light on the cap of the 30 amp generator inlet box, which is easy for you to tell when the power is on.
•What You’ll Get: 1 x 30 Amp Generator Cord (25FT) + 1 x 30 Amp Generator Inlet Box (Pre-Drilled) + 1 x Cable Tie + 1 x Storage Bag. Besides, we offer 90 days no reason to return service. If you have any problems during using our product, welcome to reach out to us, there is professional customer service waiting to help solve your problems.

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$63.99

$69.99

-9%

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Reliance Controls

Reliance Controls Generators Up to 7,500 Running Watts PB30 30-Amp NEMA 3R Power Inlet Box, Gray

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•Material Type: Powder Coated Steel

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$49.99

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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

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

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

9.1

ChoiceComparer.com Score

9.1

/ 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

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

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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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

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

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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BVOPLME

30 Amp Generator Power Inlet Box, ETL Certified - NEMA L14-30P Generator Box for Generator Cord, Heavy Duty Weatherproof Power Transfer Box for Outdoor Use (7200W, 120/240V)

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•【Professional-Grade Power Transfer Solution】Designed for heavy-duty outdoor use, our 30 Amp L14-30 Generator Inlet Box delivers 7200W (120/240Vac) stable power to keep your home appliances running during outages. Compatible with 6-12 AWG cords, it ensures seamless connectivity for generators, RVs, and emergency backup systems
•【ETL-Certified Safety for Peace of Mind】 Rigorously tested to meet U.S. safety standards, this 30 Amp inlet box features spark-resistant terminals and a secure locking mechanism, preventing accidental disconnections. 100% compatible with all NEMA L14-30P generator cords—no compatibility worries
•【Brand New Version】The reinforced 2.5mm steel baffles and 20% larger internal space fully enclose plugs. Ideal for extreme weather conditions—no more tripped circuits from moisture
•【Waterproof and anti-corrosive paint】Our 30 Amp Generator Inlet Box coated with 3-layer anti-corrosion paint, the housing withstands salt spray, UV rays, and -30°F to 150°F temperatures
•【5-Minute Hassle-Free Installation】Pre-drilled holes on all 4 sides allow flexible wiring routes, saving 50% setup time. Includes stainless steel screws and a template—no extra tools needed

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$48.99

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islewire

Islewire 30 Amp Generator Power Inlet Box, Pre-drilled NEMA L14-30P Box for 4-Prong Generator Cord, 125/250V, 7500W, Weatherproof NEMA 3R for Outdoor Use, LED Indicator, Emergency Ready, ETL Listed

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•30 Amp Generator Power Inlet Box: This outdoor power inlet box supports 30 Amp L14-30 generator cords, with a 7500W capacity and compatibility with 6-12 AWG wires. Its weatherproof and durable construction ensures safety and reliable performance in harsh weather conditions, making it ideal for emergency backup power during outages.
•3R Rainproof Enclosure: Crafted from high-grade galvanized steel, this 30 Amp generator inlet box is resistant to rust, corrosion, wind, rain, snow, and UV exposure. Its robust construction ensures long-lasting durability and dependable performance, even in the harshest outdoor environments.
•Convenient Green Light Indicator: Equipped with a safety indicator light on the generator box cover, this L14-30 generator inlet box clearly signals when power is connected and running. This feature enhances visibility, especially in low-light conditions, and provides instant feedback on power status for improved safety.
•Pre-drilled Knockouts for Easy Installation: The 30 Amp 4-prong generator inlet box comes with four pre-drilled holes on all sides, allowing flexible wiring from multiple directions (left, right, bottom, or back). The removable front cover and pre-drilled knockouts make installation quick and hassle-free, saving time and effort.
•ETL Certified for Safety: This NEMA L14-30P power inlet box meets ETL safety standards for outdoor use. It is fully compatible with 30 Amp generator cords, offering peace of mind with safe, efficient, and reliable operation for your backup power needs.

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$18.99

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