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#1
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thru hull fittings
anyone knows why the ABYC does not recommend this fitting for below waterline fitting http://www.perko.com/images/catalog/...Fig%200333.jpg
I'm replacing all my bilge pump thru hull fittings with s/s and the below water fittings with the above item along with the scupper item below http://www.perko.com/images/catalog/...Fig%200285.jpg thanks jet 
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#2
02-27-2015, 08:27 PM
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If their plastic they can break off (under the water line) and flood the boat. I have metal and once a year check them.
P/s use a check valve on the thru hull fitting, I put them on all mine.
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Tis better to be quiet and thought a fool than open your mouth and prove it!! 1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson  
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#3
02-27-2015, 09:02 PM
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They are the wrong plastic for below water line. You want MARELON.
The first link shows a scupper with a flap which would never be used BELOW the waterline. The second link is a deck drain Although not the best, it would be reasonable to use the second fitting as your deck drain connected to the first fitting as a thru hull scupper just above the waterline.
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1984 V20 "Express" & 2003 Suzuki DF140 (SOLD!) 2000 GradyWhite 265 Express YouTube/SkunkBoat https://www.youtube.com/channel/UC4F...znGospVOD6EJuw Transom Rebuild https://www.youtube.com/watch?v=EEz94NbKCh0 https://www.youtube.com/watch?v=Oe_ZmPOUCNc
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#4
02-27-2015, 11:51 PM
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THANKS, will work on looking for a bronze thru hull fitting.
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#5
02-28-2015, 07:57 AM
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NEVER have ANYTHING other than Brass, Bronze or SS under the water line as a thru-hull. Period. My personal choice is SS.
__________________
1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God) Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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#6
02-28-2015, 05:21 PM
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Quote:
Also, never use a Brass fitting on aluminum (such as fuel tank) because of bi-metallic corrosion. Bronze contains copper and nickel and does not have the same problem, provided that you bond them in common with all other submerged metal( the motor and all other fittings). SS also needs to be bonded. A big PRO for using MARELON is not needing to maintain a good electrical bond
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1984 V20 "Express" & 2003 Suzuki DF140 (SOLD!) 2000 GradyWhite 265 Express YouTube/SkunkBoat https://www.youtube.com/channel/UC4F...znGospVOD6EJuw Transom Rebuild https://www.youtube.com/watch?v=EEz94NbKCh0 https://www.youtube.com/watch?v=Oe_ZmPOUCNc
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