5 PUSH-ON TYPE ONLY TRV ADAPTOR KIT for EVE 30mm Thermostatic Valve Head/SMART
This is a tough Fibre-Composite Shatter proof Adaptor, not cheap brittle plastic like others. 22.6mm, 2 Oblong lugs sticking out of opposite sides of valve. The 5 Valve types are. 22mm, 4 notches on valve shoulder ring.