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 ?