1 Scope
1.1 Scope
This Standard covers tapped no-hub couplings, specialized plumbing fittings designed to connect
primer lines to plastic and/or cast-iron P-trap assemblies in drainage systems and specifies
requirements for materials, physical characteristics, performance testing, and markings.
These couplings feature a rotatable tee or pipe stub for the primer line, embedded rigid bands
for structural support, external metal sheaths for reinforcement, and gasketed ends with paired
pipe clamps for secure sealing. Tapped no-hub couplings are intended for use in commercial and
residential plumbing systems where a primer line must be connected to a P-trap, typically in
floor drains, floor sinks, or similar drainage fixtures. The design allows for flexible orientation
and elevation of the primer line connection, facilitating installation and maintenance while
ensuring a reliable seal and mechanical integrity.
