SP PoolQuip Davey Spa-Quip Full Flow 2 way 40mm valve. Valve has Teflon seals for long service life. Red handle valves have a Teflon seal where the blue handle valves have a standard seal. Red internals fit many older versions. Now sold as a PoolQuip valve and may come with a Black handle.
Internals can be used to replace old broken or leaking valves.
These have been sold as many different brands and colours but use the same mouldings.