The 1240 Packless Radiator Valve is applicable to both hydronic and steam heating systems from 25″ Hg vacuum to 125 PSIG. It can also be applied to water systems up to 125 PSIG. Our highest quality valve, the 1240 has a unique design that utilizes primary and secondary levers of high tensile, non-corrosive alloys to ensure trouble-free operation. The 1240 Packless Valve opens and closes in less than one turn and is equipped with an indicating dial. This valve has a back seat safety feature to prevent leakage under failure conditions. It is available in two patterns (AP and ST) and in sizes 1/2″ and 3/4″.