Size:DN25-DN530 Surface: can be:Paint,black, Epoxy or Galvanization etc, Standard:UL/fm BS/DIN/ANSI/GB/JIS approval Specification of DI grooved fitting1) Standard grooved specifications: according to VICTAULIC2) Material: Ductile Iron conforming to ASTM A536,3) Thread : BSPT & BSP & NPT4) Surface TreatmentEpoxy-RAL3000 & Painted-RAL 3000 & Painting-ORANGE5) Gasket: EPDM6) Bolts and Nuts: ISO 898- ...