The coupling connects 2 threaded pipes with different diameters, with a hexagonal head for an increased bearing surface when adjusting the fitting
MECCANIXITY Brass Pipe Fitting Water Meter Coupling G3/4 Female x G1/2 Male Thread Hex Connector Adapter 38mm Length Pack of 2
Brass Meter Coupling · Brass Threaded Fittings · RMMCIA
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George Kent Meter Set Coupling GKM Water Meter PSM Brass Water Meter 1/2''/3/4''/1
