Rego 1784 NG — 1/2" Natural Gas Regulator

What gases is it compatible with, and has it been oxygen cleaned?

This unit is designated for natural gas service. The listing does not indicate whether it has been oxygen cleaned, and given the natural gas designation, oxygen cleaning is unlikely. Regulators used in natural gas service should not be repurposed for oxygen without complete disassembly, cleaning to CGA G-4.1 standards, and compatible seal replacement.

What should I inspect before putting it into service?

Visually inspect the body for cracks, corrosion, and thread damage, then check the diaphragm and seals for hardening, cracking, or deformation. Bench test the unit to verify it locks up at shutoff, maintains stable outlet pressure across the flow range, and doesn't creep or drift. Check the vent opening for blockage and verify the spring and internal components move freely without binding, as used regulators often have debris or corrosion in the pilot system.