what size of anti-siphon valve in Bayliner 175 with 3.0L Mercruiser?

[jack black]

I see 2 sizes in Iboats parts: 1/4 or 3/8 thread:
http://www.iboats.com/Moeller-Aluminum-Anti-Siphon-Valve/dm/view_id.392106
Which one to order?
Thanks and pardon my ignorance!

 

[Don S]

Re: what size of anti-siphon valve in Bayliner 175 with 3.0L Mercruiser?

Find out what size threads you have in your tank.

 

[jack black]

Re: what size of anti-siphon valve in Bayliner 175 with 3.0L Mercruiser?

Find out what size threads you have in your tank.

Thanks Don. The problem is I'm nowhere near my boat at the moment.

Also, I'm not sure why the thread was moved here. I thought it was a boating question?

 

[Don S]

Re: what size of anti-siphon valve in Bayliner 175 with 3.0L Mercruiser?

Oops, clicked the wrong (tiny print) link. Will move it to where it was supposed to be.

 

[jack black]

Re: what size of anti-siphon valve in Bayliner 175 with 3.0L Mercruiser?

OK, I measured the OD and it's 13mm. That should make it 1/4" NPT.
I'm going to order it now. Interestingly, local West Marine is out of stock.
Now, I need to find some Loctite Pipe Sealant with Teflon.