What is the thread on my outside faucet.

[MACVA]

I have an outside water faucet, most likely from the early 60's, and the male thread is not the same thread as my host connection. Is it possible to get a threaded adaptor for it?

 

[Geofd]

Are the threads like a machine thread rather than coarse ?????

 

[RS]

If you could take a good close-up picture of it and post it, along with an accurate diameter we might have some idea. It could be 1/2 or 3/4 npt, or maybe part of the faucet is missing.

 

[MACVA]

I have an outside water faucet, most likely from the early 60's, and the male thread is not the same thread as my host connection. Is it possible to get a threaded adaptor for it?

They seem to be machine thread but a different pitch.

 

[MACVA]

They

If you could take a good close-up picture of it and post it, along with an accurate diameter we might have some idea. It could be 1/2 or 3/4 npt, or maybe part of the faucet is missing.

Ok, I will do that, it does seems shorter than normal. I tried a 1" female fitting but it wouldn't thread.

 

[Twowaxhack]

It probably is the left over threads of where a vacuum breaker once attached to the hose Bibb.

 

[Twowaxhack]

 

[MACVA]

That doesn't look like it. But what is a 'vacuum breaker' and where would it be used? Thanks

 

[Twowaxhack]

Its

That doesn't look like it. But what is a 'vacuum breaker' and where would it be used? Thanks

Its a one way valve to prevent back siphoning through a plumbing system. The type I’m speaking of screws onto a hose Bibb faucet.

 

[RS]

View attachment 48319

I have installed that type, there appears to be a broken off set screw (designed to break) to prevent them from being taken off.

 

[Twowaxhack]

I have installed that type, there appears to be a broken off set screw (designed to break) to prevent them from being taken off.

They come apart in the middle. That’s where the fine threads are.

See this ?

 

[RS]

They come apart in the middle. That’s where the fine threads are.

See this ?
View attachment 48322

Yes, I'm well aware of that! If you drill out the broken set screw you can probably get the piece with the fine threads off, and then just screw a hose on, or get a new vacuum breaker.