This Listing Is For A Pair Of

Check Valves /  Non Return Valves
Designed To Fit In Fitting Or Pipe15mm Inside
Prevents Backflow Of Water
Suitable Hot Or Cold

These Are Found In Many Showers TMV 's / Blending Valves Taps

Also Used in Pumps

Salamander

Grundfos

Stuart Turner

14.7mm Diameter, O ring Included Takes It To 15.3mm

16mm Long