A compression waste fitting forms a watertight, demountable pipe joint by mechanical compression rather than adhesion or fusion: a threaded nut driven onto the fitting body axially compresses a tapered elastomeric seal against both the outer wall of the pipe and the internal seat of the fitting, converting rotational torque into radial sealing force. The governing constraint is dimensional correspondence — the fitting's nominal bore and the pipe's outside diameter must match (e.g. 40 mm to 40 mm, 32 mm to 32 mm), since the seal's compression range is specified for one diameter only. The concept belongs to non-pressurised drainage and waste plumbing within building services, and exemplifies the broader class of mechanical, reversible pipe joints as distinct from solvent-welded or push-fit joints.
A compression waste fitting forms a watertight, demountable pipe joint by mechanical compression rather than adhesion or fusion: a threaded nut driven onto the fitting body axially compresses a taper…