Large and Medium Pressure Relief Valves and Devices With/Without Contacts Model T-50 (50mm) , T-80 (80mm) without Switch Model T-50 (50mm) , T-80 (80mm) with Switch PRV Type T-50 (50mm) With Integrated Switch & Cover PRV Type T-50 (50mm) & T-80 (80mm) with Switch & Threaded/Flange Type Direction Shroud PRV Type T-2 (50mm) to T-6 (150mm) PRD for Power Transformers Model-305 Size: 150mm Direction Shroud for 150mm PRD