The Spec Master HPD6230 series single stage differential autochange control panels are designed for primary pressure gas control of non-corrosive or toxic, high purity gases up to grade 6.0 purity (99.9999%), on gas distribution systems where slight pressure variation is acceptable.

■ HPD6231 Series | Single Stage Twin Cylinder Piston Differential Autochange Gas Control Panel, FKM Seal
■ HPD6232 Series | Single Stage Twin Cylinder Piston Differential Autochange Gas Control Panel, EPDM Seal