Universal coupling The Universal Couplings are designed for pipelines As a wide tolerance system it will fit most standard pipe materials and therefore dramatically reduces the number of dedicated Couplings which need to be stocked for maintenance purposes , It is suitable for steel , GRP, PVC, PE, Ductile Iron , Cast Iron and Asbestors Cement . When connecting PE pipes , It is important that pipe inserts are fitted to the PE pipes . 1) All the couplings are assembled by " D " bolts . 2) Bolts ,Nuts and Washers are in carbon steel Grade 4.8 , 8.8 with zinc plated , dacromet coating or according to customer's request. 3) Body material is Ductile iron GGG500-7 . 4) Fusion bonded epoxy powder coating in blue, black or red or according to customer's request . 5) Gaskets material : E.P.D.M. , NBR or SBR . Specification Unit Weight Sealing Ranges(mm) inches mm kgs 2" 50 3.6 59~732 1/2" 65 4.50 72~853" 80 4.83 88~1034" 100 5.51 108~1285" 125 7.74 132~1546" 150 8.32 159~1827" 175 11.30 192~2098" 200 9.95 218~23510" 250 14.50 271~28912" 300 18.62 322~34014" 350 26.00 374~39116" 400 28.85 417~43718" 450 33.40 480~50020" 500 50.00 526~54624" 600 54.10 630~650 6) sample for free, but you should pay for the freight charge for the samples 7)payment term 1)30% TT upon placing order and 70% TT when the goods are finished but before shipment or the payment can be 50% upon placing order,and balance 50%upon Copy B/L,. 2) L/C or D/P