Our Scamp 13 didn't have city water and only a hand pump for the onboard water. Converting it over to a bar faucet with city water on the cold side and onboard running water on the hot side of the faucet.
To do the city water side we purchased JR Products 160-85-A-26-A Polar White City Water Flange with 1/2" MPT
Next we marked the shell with where to cut in for the inlet. Used a protactor drawing set.
Next we masked the area to be cut out with painters tape to prevent fiberglass chipping and drilled two pilot holes for the jigsaw blade.
Drilled the three anchor holes and removed the masking.
Put butyl tape behind the inlet flange and around the rivet barrels and popped the rivets.
Clean up excess butyl and done with the exterior. I'll post the interior shots when completed.
Time for job 45 minutes. Cost $19.