Waga MULTI/JOINT 3107 Plus Restraint Reduced Coupling

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The Waga MULTI/JOINT 3107 Plus wide-range reduced coupling is an engineered tensile-restraint fitting that joins and transitions between pipelines of different outside diameters and different pipe materials in a single component. Available from DN 50 to DN 550 on the smaller socket and DN 65 to DN 600 on the larger one, in PN 10 and PN 16, it is used in potable water, wastewater, cooling water and gas distribution networks, eliminating multi-component adapters and dedicated transition spools in both buried and above-ground industrial piping.

The body is cast in ductile iron EN-GJS-450-10 (GGG 45) in accordance with EN 1563, with a minimum tensile strength of 450 N/mm² and minimum elongation at break of 10%. Corrosion protection is provided by Resicoat RT 9000 R4 fusion-bonded epoxy powder over a grit-blasted surface, applied to a minimum film thickness of 250 micrometers in red brown RAL 3011. This GSK-certified coating delivers 20 Joules impact resistance at 23 degrees C, more than 720 hours of salt spray resistance, chemical stability across pH 2 to pH 13 and full dielectric isolation of the joint.

The progressive Uni/Fikser gripping mechanism combines high-grade AISI 316 stainless steel teeth with polyoxymethylene (POM) wedge segments and polyamide topple elements, developing complete axial restraint without point-loading or deforming the pipe wall. Sealing is by EPDM to EN 681-1 type WA for potable water or NBR to EN 682 type GB for gaseous fuels. Each socket accommodates up to 43 mm of outside diameter tolerance per nominal size and up to 8 degrees of angular deflection, 16 degrees across the complete coupling, compensating ground settlement and pipe misalignment. Fasteners are grade A2 stainless steel with Lubo dry anti-friction coating, preventing thread galling and ensuring accurate torque-to-tension conversion on HDPE, PVC-U, steel, ductile iron and grey cast iron pipe.