Spa Plumbing Parts

Complete spa plumbing repairs with spa and hot tub plumbing parts from Waterway Plastics, Jacuzzi, Custom Molded Products, Balboa Water Group, and Horizon Spa & Pool Parts. PST Pool Supplies stocks O-rings, gaskets, pipe fittings, manifolds, pipe extenders, tailpieces, and adapters for spa plumbing systems — starting from $9.70.

Spa plumbing uses a mix of standard PVC fittings and spa-specific components with proprietary thread forms and connection types. The components in this collection cover the most frequently replaced spa plumbing parts: O-rings and gaskets — the Buna-N O-ring (13/16\" ID x 1/16\" cross section), Jacuzzi G-136 gasket (13-0191-04-R), generic 2-3/4\" ID gasket (O-407), Jacuzzi ERC/PH/RC diffuser square ring (G-316), and Jacuzzi B Series volute square ring provide sealing solutions for specific Jacuzzi pump and fitting applications. Square rings (rectangular cross-section O-rings) are used in pump volute and diffuser assemblies where a standard round O-ring would roll out of the groove under compression. Pipe fittings — the CMP 45° street elbow (2\" slip x 2\" spigot) is a compact direction change fitting for tight equipment cabinet installations. The manifold wye (1\" slip x 3/4\" slip x 3/4\" slip) splits a single supply into two branch lines — used in air and water distribution manifolds. The 2\" MPT x 1-1/2\" barb adapter transitions from threaded pipe connections to barb hose connections. Pipe extenders — Waterway inside pipe extenders (1\" and 2\") and outside pipe extender (2\" spigot) repair cut-too-short pipes by extending the connection point without cutting into the spa shell — invaluable for field repairs where replumbing is impractical. Tailpieces and hose adapters — the Waterway 1-1/2\" buttress thread tailpiece, 2\" union x 2\" spigot tailpiece, and 1-1/2\" MPT x 1-1/2\" hose adapter complete pump and heater union connections in Waterway-plumbed spas. The Balboa 10-32 x 1/4\" screw provides the specific fastener used in Balboa component assembly.

Spa plumbing repairs require the correct fitting type — slip, spigot, barb, male pipe thread, buttress thread, and union connections are not interchangeable. When sourcing a replacement fitting, note both the connection type and the size at each end of the fitting. Buttress thread is a coarse-pitch proprietary thread used in spa pump and heater unions — it is not compatible with standard NPT pipe thread despite similar appearance.

Shop spa plumbing parts at PST Pool Supplies and complete your spa plumbing repair with the exact fitting your system needs.