Waterway Filter Unions | 400-9974B
Waterway
SKU: 400-9974
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.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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