Double union ball cork
size: 2 inch or 63mm
double union ball valve has, as implied, two unions on it – one on either side. the unions enable the valve to be unscrewed and removed from the pipeline, where it can be serviced or checked to see whether it's blocked, and then easily put back in the pipeline where the unions can get screwed back on. this means that to get to your valve and service it, you won’t have to worry about cutting your pipe. it also means that returning your valve to your pipe system is a fast process and won’t keep your system down for long.