Help Identifying valve on outside tap All aspects of plumbing questions and answers, help, tips and information

[AllenO'R]

Can anyone identify this valve please, it's located between an isolating valve as the pipe disappears through the wall to an outside tap. After turning on the isolating valve there is no flow to the outside tap, help please.

[stoneyboy]

Hi Alleno'r,
It will be a non return valve.
Regards S