1.cast iron surface box 2.for valve check and drainage system. 3.Loading Class EN124 A15, B125, C250 or D400. Cast iron valve boxMaterial: Grey cast iron GG20 or Ductile iron GGG50for valve check and drainage systemLoading Class EN124 A15, B125, C250 or D400Weight: 2.5kg to 100kgHardware: steel chain or boltCoating: black bitumen coating. Dia. 315 Cast iron valve box