I've been looking for these small vent line caps for a while, but not sure where to look. I've tried google lense but all I get back are large dorade or exhaust line vent covers. These are 1/2"=3/4" tank vents. Anybody have a clue?
vent cap
- Thread starter Db421
- Start date
Search for marine holding tank vent, or gas tank vent
They may sell them on this site but the price seems to be a little out of line.
Sailboatowners - Store
Sailboatowners - Store
Well, that's the price West Marine sells them.
Edit:Well, that's the price West Marine sells them.
A little more investigation. Perko makes a vent of chrome plated zinc alloy that sells at Defender for about $17 and a chrome plated bronze vent that sells for about $60, which is probably the same on SBO sells.
Better yet, if we're talking about a holding tank vent thru-hull, forget about a cap for it. Replace the "vent" thru-hull with an open bulkhead (aka "mushroom") fitting. "Vent" thru-hulls are designed to keep sea water out of fuel and water tanks. They're totally unsuitable for use on holding tank vents because they don't let the tank "breathe" which is necessary to prevent odor from being created...but boat builders use 'em on holding tanks too 'cuz it costs them a little less than buying a different one for holding tanks. An open bulkhead fitting has another advantage: it allows you to put a hose nozzle against it to back flush the vent regularly to prevent vent blockages. Anything that tries to set up housekeeping in the vent line will get a water slide ride into the tank.
--Peggie
--Peggie
Past :
Brass vent caps corroded like crazy. Nickel plated brass (or bronze).
Present :
New ones are SS with internal loops of about 18" up to the underside of the deck.
With the internal NPT thread in the thru-hull, you can pull a quick upwards turn with a street ell 90° elbow and into a hose loop before heading off to the tank.
Present :
New ones are SS with internal loops of about 18" up to the underside of the deck.
With the internal NPT thread in the thru-hull, you can pull a quick upwards turn with a street ell 90° elbow and into a hose loop before heading off to the tank.
The internal threads vary from 1/2" NPT up to 1-1/2" NPT. The MIP X hose adapter which goes on next is pretty much anything you want it to be.