Single Union Non Return ( One Way) Valves fitted in line with flow actuation

- All Fastlight PVC-U pipe and fittings are high quality, approved by the Water Regulations Advisory Scheme and fully reef safe. 
- All pipe and fittings are metric and compatible with many other makes of metric pipe with joints connected using solvent weld glue. 
- It is good plumbing practice to use the next size up Non Return (One Way) Valve from your pipework in conjunction with reducers as a 32mm Non Return valve will have a 25mm bore diameter through the centre.