1.material: carbon steel 2.ength: as per customers' requirement 3.all fittings for fire sprinkler system, fire fitting include nut, nipple and reducer:1. material: carbon steel with zinc plated2. thread: nipple: NPT (BSPT) 1" reducer: NPT (BSPT) 1/2", 3/4"3. packing: carton4. min order: 2000pcs fire fitting