What thread

[rmully]

I have a Chief cylinder that has plugs in the two ports..... looks like 1/2 pipe thread but it is not. Wondering what size this might be as it is just slightly smaller..... anyone know as I will have to order a fitting.

 

[oosik]

12 mm metric???

 

[bigdeano]

Probably British Standard Pipe. You can buy adapters.

British Standard Pipe - Wikipedia, the free encyclopedia