Watts Series Figure 41A Safety Relief Valves for air, gas, and vapours are ASME Section VIII valves used for compressors, intercoolers, aftercoolers and receivers, air makeup units, gas burners, pneumatic conveying/elevating equipment, dryers and other pressure vessels and piping, that handle air, gases, and vapours to 250psi. Series Figure 41A is a high capacity safety relief valve with a top guide and full nozzle. It consists of a bronze body (sizes 1/2 to 2-1/2 in.) with NPT threaded male inlet and threaded female outlet (drain) connections, or a cast iron body (sizes 1-1/2 to 6 in.) with flanged connections. ASME Section VIII rated.