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Compass Marine How To | all galleries >> Welcome To >> Installing A Seacock & Thru-Hull Fitting In A New Location > Pick Your Location
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Pick Your Location

Pick Your Location

This photo is showing the spot for the new seacock & thru-hull as chosen from inside the vessel.

1- Once you have chosen your spot drill through the hull from inside using a 1/4" drill bit. The reason for the 1/4" bit is that it matches the size bit used on most hole saws.

2- You then drill into the hull from outside using the proper sized hole saw to match the thru-hull. Start the hole saw in reverse as I have done here and you get no gelcoat chipping. Once through the gelcoat switch to forward and drill up through the hull making sure you are perpendicular to it.

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Paul 29-Jul-2015 21:06
Any reason you couldn't use butyl tape to seal a thru-hull?
Mike 21-Jun-2015 02:01
when installing a through-hull fitting, how close could I get to an existing fitting without compromising the integrity of the hull
Alex 31-May-2015 18:04
This is great, thank you! One thing I'd like to confirm, when using a thru-hull that is listed as 3/4" should I be using a 3/4" hole saw? I test fit it in the hole saw and it seemed a little loose (Which makes sense, just want to be sure!). It's and "Apollo 65-BN7-50"