The 627 Series direct-operated pressure reducing regulators can be used with natural gas, air, or a variety of other gases and are offered in 3/4″, 1″, or 2″ body sizes with NPT end connections or 1 or 2 inch body sizes with ANSI Class 300RF and 600RF flanged end connections. Offered in Carbon Steel or Ductile Iron Bodies with Carbon Steel, Ductile Iron, or Aluminum Spring Case materials. The Fisher 630 is offered in 1″ and 2″ only.