Topic: through hull for sewage outlet
So I'm looking to put in a 1 1/2" through hull for the out from the head as the boat does not currently have one (only an onboard holding tank in the V Berth). Anyway, I've got a bronze sea cock and through hull to install and was wondering if anyone had pictures or could tell me where the through hull has been placed in their boats. Further more it seems that the actual thorugh hull is very long for the amount of deck it has to actually pass through and because of space I'd rather not build up a backing plate of 1 1/2" or so that would be necessary to snug down the seacock on the through hull, that leads me to my question... is it ok to cut off threads of the through hull or is it recommended you install with all the threads and a thick backing plate?
Also I have a jabsco hand pump head and was wondering if there needs to be an additional check valve on the sea cock to prevent the water from running in through the head or if the heads one way valves tend to do the trick (or maybe it's no an issue at all?)
Ok, look forward to other peoples thoughts
Wil & Didi