Airgas Model N140FHF Brass Specialty High Purity High Flow Pressure Regulator With 1/2" FNPT Connection Single Stage They feature an oversized “pancake”

They feature an oversized “pancake” body of magnesium alloy with a Buna-N diaphragm

The external nickel plating

They feature a brass piston sensor in the first stage

galvanized steel with a powder-coat paint finish

Airgas Model N140FHF Brass Specialty High Purity High Flow Pressure Regulator With 1/2" FNPT Connection Single Stage They feature an oversized “pancake”This series of regulators is used for applications requiring high gas flow rates and a compact design. These regulators can handle flows up to 250 liters per minute of nitrogen with only a 5 psig pressure drop. In addition, these units will handle hydrogen flow up to 1,000 liters per minute without the resonance problems associated with other regulators in this same application.