fitting to use for 1" vent

[fiestaMojo]

I'm installing a new holding tank, using a 1" vent line. . . question - does anyone make a "clamshell" fitting with a 1" hose barb, or am I stuck using a standard 1" thru-hull? thanks for any input/advice. . .
Pat

 

[Steve Dion]

I would not use a clamshell for a holding tank. It is much easier to back flush it if you use a standard thru hull fitting.

I like to flush the vent after each pump out.

 

[fiestaMojo]

1" vent

I guess I thought with a 1" vent, the chance of getting unintentional backflush, i. e. rain, wave, etc. would be too high, and when I got the boat - 81' 33 - it had a "clamshell" type fitting on the vent. . .

 

[Ron20324]

It is much easier to back flush it if you use a standard thru hull fitting. I like to flush the vent after each pump out.

Ditto Steve. Also, if the vent hose goes uphill from the thruhull before getting to the tank the rain will not go into the tank. Waves not such a big concern, I put in a 1.25 "standard" mushroom thruhull for my vent. No problems.