Waterway Cartridge Filter Fitting Package | 400-9974B

The Waterway 400-9974B Fitting Package is a dedicated plumbing connection kit designed specifically for Waterway inground cartridge pool filters, including Crystal Water–style cartridge filter housings. This kit provides the correct union fittings and seals required to properly connect the filter’s inlet and outlet ports to standard pool plumbing.

What These Parts Are For

This fitting package is used only at the cartridge filter tank. The components in this kit allow water to flow from the pump into the cartridge filter and then out of the filter toward the heater, chlorinator, and pool returns, while also allowing the filter to be disconnected for service without cutting pipe.

Included Components and Their Purpose

• Union Nuts: Thread directly onto the cartridge filter’s inlet and outlet ports to secure the plumbing connections.
• Union Tailpieces: Glue into the pool plumbing and mate with the union nuts so the filter can be easily removed for cartridge cleaning or replacement.
• Union O-Rings: Create a watertight seal between the union halves and the filter body to prevent leaks under pressure.
• 2½" to 2" Reducers: Allow the filter’s larger 2½" ports to be connected to standard 2" PVC pool plumbing.

Where These Parts Are Used

• Filter Inlet: Connects pump discharge plumbing to the cartridge filter.
• Filter Outlet: Connects filtered water to downstream equipment and return lines.
• Service Connections: Union design allows easy filter removal without cutting plumbing.

Installation Notes

• Hand-tighten union nuts evenly to avoid damaging O-rings.
• Use PVC primer and cement only on the glued tailpiece connections.
• Do not glue union nuts or O-rings.
• Check for leaks after startup and retighten unions if necessary.

Maintenance Tips

• Inspect union O-rings during cartridge cleaning and lubricate as needed.
• Replace O-rings if flattening, cracking, or leaks occur.
• Keep union threads clean to ensure smooth tightening and proper sealing.