Nibco, Inc. 701D 3/4 Drain Coupling Bronze bathware

3/4-Inch Bronze Drain Coupling

The NIBCO 701D is a sweat fitting coupling made from cast bronze for copper tube installations. It joins two 3/4-inch copper tubes using cup connections on both ends. The fitting carries no centre stop, so tubes slide fully through if not mechanically limited. It suits air and non-potable water systems in residential or light commercial plumbing.

Pressure and Temperature Limits

Rated at 466 psi at 200 degrees F, the coupling handles typical hydronic and compressed-air pressures. Maximum operating temperature reaches 400 degrees F, covering most hot-water heating loops. These limits define the practical envelope; exceeding either risks joint failure or accelerated dezincification of the bronze alloy.

Capacity and Headroom

The 3/4-inch bore accommodates standard flow rates for branch drains and equipment connections without restriction. Bronze construction resists corrosion better than plain copper in aggressive water chemistry, extending service life. Systems demanding larger diameter or potable-water approval will require a different fitting.