CMP 40mm 90° Right-angle Check Valve (one way valve). Made by the same company (Fluidra). They are made of CPVC, use Teflon seals and have long sockets for better glued joints. 

Made from high temperature CPVC material, the CMP products are long lasting and durable. Capable of running at a pressure of 50 PSI, the CMP products are suitable for most residential pool systems. NSF certification furthers guarantees a superior product quality.

They have a 32-step precision position and come with label-tags. 

We have a huge overstock of these, so will be selling them below-cost until further notice.