size of unions on RSM s500

[coralrama]

Does anyone know the size of the unions used for the overflows and return for the rsm s500? I want to move my sump to the basement, and would rather keep the existing plumbing intact. I was hoping to buy new unions, and hook up new piping to half and then just unscrew the drains and return lines and hook up the new without having to cut the existing drain pipes and return lines from their existing connections.

 

[RedSeaKev]

Hi Coralrama, I would not try and match the unions as they are sourced in China and there may be compatibility issues, the pipe work sizes are as follows.

Inlet 25mm
Main down flow from the valve 40mm
Overflow 32mm

I hope this helps.

 

[coralrama]

Thanks Kev, I found https://flexpvc.com/cart/agora.cgi?product=PVC-Fittings-Metric-Adapters

If they don't work with the existing unions I'll cut the pipe and use them to at least get onto the US system


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