The OEM Pentair Base with Pipe Plugs WC104-78P is a direct replacement component for Sta-Rite Posi-Flo pool and spa filter systems. Engineered for durability, this base supports stable installation and system alignment, helping maintain the structural integrity of your filter setup. ItÕs designed to fit cartridge filter models such as PTM50, PTM70, PTM100, PTM135, as well as T-50TX, T-70TX, T-100TX, and their TXR counterparts. Built from corrosion-resistant materials, the base endures harsh weather and pool chemicals. The included pipe plugs ensure a secure, leak-free seal, enhancing overall filtration performance and preventing water loss at connection points.

• Built for Posi-Flo Filters: Compatible with Pentair Sta-Rite Posi-Flo II models PTM50 through PTM135 and T/TXR series filters.

• Stabilizes Filter Systems: Provides a strong, level base for the filter, preserving operational integrity over time.

• Rugged Outdoor Design: Constructed from corrosion-resistant materials to withstand poolside elements and long-term exposure.

• Leak-Free Operation: Includes pipe plugs that ensure a watertight seal to support consistent filtration and efficiency.

• Maintains Filter Alignment: Crucial for securing the filter in place, reducing vibration, and supporting dependable system function.

• Pentair Sta-Rite Posi-Flo II Cartridge Filter Model: PTM50, PTM70, PTM100 and PTM135
• Pentair Sta-Rite Posi-Flo Cartridge Filter Models: T-50TX, T-70TX, T-100TX, T-50TXR, T-70TXR,T-100TXR

Need to replace the base on your Posi-Flo filter system? This section helps walk-in customers confirm that the WC104-78P base fits their filter model, includes pipe plugs, and provides tips for installation and part wear.

Matching the Base to Your Posi-Flo Filter

Before you head to the store, use these questions to confirm the WC104-78P base is compatible with your filter setup.

Will this base work with my PTM100 filter if I bring it to the store?

Can I find this part in-store for an older T-70TXR model?

Is the WC104-78P the correct fit for my Posi-Flo II system?

What should I look for on my current base to match it in store?

Can I buy just the base with pipe plugs without other hardware?

Installing the Base After Local Purchase

Once youÕve picked up the replacement base at DPM, these install tips help ensure it goes on smoothly.

How do I install the new base after buying it in store?

Do the pipe plugs come pre-installed or loose in the box?

Should I use sealant on the plugs during installation?

Can I replace the base without disassembling the entire filter?

Identifying Base Damage Before Replacing

Filter instability can often come from base wear. These questions help walk-in customers know when itÕs time to replace it.

What signs suggest my filter base is warped or cracked?

Can a leaning filter mean the base has failed?

Should I replace the base if water is leaking near the bottom?

Is corrosion or UV damage common in these bases over time?