what size hole do you need to cut? how far apart are the mounting screw holes (center to center)?

1-7/8" minimum. A 2" hole will work great too. Three holes spaced 1-11/16 in an equilateral triangle for mounting with one hole directly in line with the ground prong.

I have noticed a few reviews saying the cap won't stay in place. Has anybody identified a way to make the cap stay in place?

I have found the solution is to find a washer the same diameter as the inside of the cap. insert washer in cap - should be a tight fit - close cap - cap stays closed.

How is the inside configured meaning is there a female receptical for a plug inside the trailer

No. The inside is configured to accept wiring. I used this to feed a second air conditioner on my camper. Just attach the female end of an extension cord to this and plug the male end into a 120 vDC receptacle.

Can this be used on a home as a generator inlet?

I have no idea. It is rated for 240 AC up to 20 Amp.

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Description

⚡ Power up your adventures with ParkPower – where reliability meets rugged style!

UNIVERSAL COMPATIBILITY - Works flawlessly with any standard 15 Amp extension cord for instant, hassle-free connectivity.
EFFORTLESS POWER UPGRADE - Seamlessly replace or upgrade worn power inlets on your boat, RV, or cabin with a trusted 15 Amp, 125 Volt connection.
CERTIFIED SAFETY ASSURANCE - UL and CSA approvals guarantee top-tier safety and performance standards you can trust.
BUILT TO BRAVE THE ELEMENTS - UV resistant housing and cap ensure long-lasting durability even under harsh outdoor conditions.
COMPACT MOUNTABLE ANYWHERE - Sleek, space-saving design fits perfectly in tight spots, making installation a breeze wherever you need power.

The ParkPower Power Inlet by Marinco offers a durable, UV-resistant 15 Amp, 125 Volt power connection designed for boats, RVs, and cabins. UL and CSA certified, it ensures safe, reliable power delivery with universal compatibility for standard extension cords, all in a compact, easy-to-mount design built to withstand outdoor environments.

Specifications

Brand	Marinco
Color	Black
Electric fan design	Blower
Power Source	Corded Electric
Style	15 Amp, 125v
Product Dimensions	3"D x 5.1"W x 7.9"H
Room Type	Bathroom
Special Feature	UV Resistant, Mountable Anywhere
Recommended Uses For Product	Exhausting
Wattage	1875 watts
Finish Type	Unfinished
Voltage	125 Volts
Item Weight	0.2 Pounds
Included Components	ParkPower by Marinco 150BBI.RV 125V RV Inlet - 15 Amp, Black
Indoor/Outdoor Usage	Outdoor
Model Name	150BBI.RV
Control Method	Touch
Is Cordless?	No
Number of Power Levels	1
Main Power Connector Type	15A 125V straight blade inlet
Manufacturer	Marinco
UPC	093344304781
Global Trade Identification Number	00093344304781
Size	15 Amp 125 Volt
Item Package Dimensions L x W x H	8.03 x 5.08 x 2.95 inches
Package Weight	0.15 Kilograms
Item Dimensions LxWxH	8.8 x 5.4 x 3.3 inches
Brand Name	Marinco
Number of Items	1
Part Number	150BBI.RV
Sport Type	Boating

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