Reducing Coupler (Spigot x Adaptor) 316L size:Europress 316L S/S Reducing Coupler 168.3 x 88.9mm 2013 which requires certification as

2013 which requires certification as conforming to the German Standard DVGW VP614 for gas applications

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The pipe diameter is d and the Roll Groove diameter is D

Europress 316L 90° Female Elbow with Flush Wall Mount

with Z being the distance between the end of the Europress stainless steel pipe and the face of the Roll Groove Adaptor

Reducing Coupler (Spigot x Adaptor) 316L size:Europress 316L S/S Reducing Coupler 168.3 x 88.9mm 2013 which requires certification asThe Super Size Reducing Coupling is a Spigot x Adaptor fitting with the spigot for insertion into the relevant Europress fitting and providing connection to a smaller size pipe.