OR540A STYLEMaterials of ConstructionBrass: Inlet Retainer, Relief Valve, Piston, Rotor, Flow Control Housing, DISS OutletCGA 540: Nut and NippleAluminum: Body, Diss Outlet, Clear AnodizeSilicone: O-ringsSintered Bronze: 40 Micron Inlet FiltersBody Finish: Green Anodize, Laser EtchedDiameter: 1 3/8" NominalLength: 6 3/5" approximatelyWeight: 500gGauge: 1.4" 0-3000 PSI, Clean for O2 Service, UL Listing, Boot, 1/8" NPT, Fill/RefillExterior Markings: Model No., Description, "Made in "CHINA" text and "Use No Oil" textPackaging and Labeling: Box to be 7.7" x 3.0" x 3.0", Box Label Matching Current More Product Features Trademark: MEDTEK Model NO.: OR540A Standard: CGA standard Company: Danyang Meihua Co., Ltd