Internal Coupling

By Huu Khanh Nguyen · Updated October 29, 2026 · kee-klamp, tube-fitting, coupling, internal

A cast railing fitting that joins two tubes of the same size end to end from the inside, with a plug in each tube end and a ring that sits flush with the tube.

Parameters

Name	Default	Unit
Tube outside diameter	42.4	mm
Finish	white