Item Model No. Inlet Outlet Specification Smart Safe 30 mbar SS RCS20A30 20 MM 2A 30 mbar, Child Safe Mechanism Smart Safe 30 mbar SS RCS20A3OS 20 MM 2A 30mbar Child Safe Mechanism, 100% Shut-Off with Reset Mechanism Smart Safe 30 mbar SS RCS20A3OG 20 MM 2A 30 mbar, Child Safe Mechanism with Gauge Smart Safe 30 mbar SS RCS20A3OSG 20 MM 2A 30mbar Child Safe Mechanism, 100% Shut-Off with Reset Mechanism & Gauge Smart Safe 30 mbar SS RCS22A30 22 MM 2A 30 mbar, Child Safe Mechanism Smart Safe 30 mbar SS RCS22A3OS 22 MM 2A 30mbar Child Safe Mechanism, 100% Shut-Off with Reset Mechanism Smart Safe 30 mbar SS RCS22A3OG 22 MM 2A 30 mbar, Child Safe Mechanism with Gauge Smart Safe 30 mbar SS RCS22A3OSG 22 MM 2A 30mbar Child Safe Mechanism, 100% Shut-Off with Reset Mechanism & Gauge