"Works like a charm. I had previously bought Anti-Vac valves but these only worked on the sink. The bath still burbled away when the sink was emptying. Now, however, I have three items sharing the same"... (read full reviews)
"Not many places sell these. So much better than having to use solvent based and very versatile as it will fit pipes which differ by a large tolerance. Used it for the boiler outflow.
Quick and"... (read full reviews)