This question is regarding Crosswater WL1000RC Non Return Valve (NRV) - IBNRV

Crosswater valve

I have an old style (red button) concealed shower valve that has recently been playing up. I’ve exposed the unit and established that the COLD side non return valve is letting hot water pass through it (cold side inlet pipe work gets hot when the adjacent bath or sink cold tap is on). Question...I’m assuming the Non Return Valve is removed by unscrewing it from the valve body by the hex nut but don’t know what the slotted screw in the middle of the NRV does (see photo) and whether this needs to be unscrewed first (is it a locking mechanism or to release water pressure) or is it some flow calibration device? The Crosswater manual doesn’t explain... Many thanks in advance.
Asked 3 years ago by Michael Faulder, Dronfield
The NRV are just unscrewed with a spanner once the water is off .The slot in the NRV is used to shut the water off if you are just removing the temperature cartridge.

Answered 3 years ago by Barrie Seabright

View Product and Order Online:

Do you require any further help with Tap or Shower Cartridges?

Please click the following link if you would like to see other answers or ask a question regarding the Crosswater WL1000RC Non Return Valve (NRV) - IBNRV

If you've landed here and this question is not about your specific product, please take a look at these similar items on our Crosswater Cartridges page. Alternatively, if you're looking for any other brands you should view our full range of Cartridges.

If you would like to buy this cartridge or look others from the same brand, please view our Replacement Crosswater Cartridges (All)

For any other support request please get in touch.