Installing Shrader

[Thursto]

no, this is not a stupid thread about 'how dus i instole a rubba shratter valv' this is a question about metal ones.

do you have to drill a hole the size of the threads? or size of the rubber step and the threads are just there for the nut to tighten and create a seal.

pics:

WHOLE THING



DISASSEMBLED

[Novacastrian]

I would drill a hole at an appropriate size and then tap that hole.

[BigGrib]

the way i did mine (which actually has the flare out at the bottom not the top) was to drill out using a 3/8 inch which is the biggest one I had and wobbled it out a bit just to get the valve in and then tightened it down using the rubber to make the seal not the threads.

[silverdooty]

drill the hole the size of the rubber step. and yes the threads are there to tighten it.

[MaxuS]

I just drilled a hole the size of the threads, then screwed it in and it seals perfectly, i dont see any point in tapping it in when there isnt a thick wall.

[jimmy101]

Tapping is a good idea if you have the tools. If you don't then don't worry about it.

The hole should match the shoulder on the gasket if you have the right size drill bit. A small amount over, say 1/16", is probably ok.

The tricky parts is that the valve was meant to be installed in a flat piece of metal (or a piece with a very large radius of curvature). Since you are probably installing on a 3"D, or less, piece of pipe the gasket won't work as well as it would on the curved surface. In addition, the PVC is much thicker than the sheet metal the valve was really designed for. You mith not be able to even use the rubber gaskets.

What I do is put a big ass glob of pipe joint compound on the inside surface, then screw the nut + washer down and let it mash the excess compound out from underneath. This seals against the curved inner surface of the pipe.

[Mr.Russ]

all we ended up doing was:
drilling a hole the size of the threads, then wrapping threads in teflon tape and screwing in until hella tight, and then putting the rubber gasket on the back and the washer and nut then tightening it. doesnt leak at all..

you probably dont even need the rubber gaskets if you put teflon tape on the threads. it would be just like installing a nipple or hose barb or something..