Pentair / Sta-Rite C1-200PA Diffuser for Dura-Glas & Max-E-Glas Pool Pumps

The Pentair / Sta-Rite C1-200PA is an OEM-style pump diffuser used in the wet end of select Sta-Rite Dura-Glas and Max-E-Glas in-ground pool and spa pumps. The diffuser fits over the impeller and helps direct water flow efficiently through the volute, supporting strong circulation, stable priming, and consistent performance.

Key Details

• Manufacturer: Pentair / Sta-Rite
• Part Number: C1-200PA
• Common Alternate Marking: C1-200PAZ (diffuser variant/marking commonly used for the same style application)
• Part Type: Pump diffuser
• Typical Pump Families: Sta-Rite Dura-Glas and Max-E-Glas
• Diffuser O-Ring (commonly used): U9-226 (sold separately)

Common Compatibility Range

• Dura-Glas: commonly used across mid-range horsepower configurations within the Dura-Glas series
• Max-E-Glas: commonly used across mid-range horsepower configurations within the Max-E-Glas series

Best practice: match your pump model’s parts diagram or the part number molded on your existing diffuser to confirm exact fit.

Design Features

• Vane design: 5-vane diffuser style commonly used on these wet ends
• Mounting: 5 screw-hole pattern (typical for this diffuser style)
• Inlet sleeve: brass sleeve at the intake (common identifying feature)

Approximate Dimensions

• Overall diameter: ~6-1/2"
• Front-to-back depth: ~1-7/8"
• Thickness (outer edge): ~9/16"
• Inlet ID: ~1-7/8"
• Inlet OD: ~2-1/4"

What This Diffuser Does

• Directs and stabilizes water leaving the impeller for better hydraulic efficiency.
• Helps maintain prime and reduces turbulence that can contribute to noise or performance loss.
• Works with the diffuser O-ring to seal properly and reduce air/water leaks inside the wet end.

When to Replace

• Cracked diffuser body, broken vanes, or damaged screw holes
• Reduced flow after confirming baskets, filter, and plumbing are clear
• Persistent air in the pump basket traced to wet-end sealing surfaces (often replaced with the diffuser O-ring)
• Wet-end rebuild where internal parts are worn or distorted

Installation Notes

• Turn off power at the breaker and relieve system pressure before opening the pump.
• Always inspect and replace the diffuser O-ring if it is flattened, cracked, or swollen.
• Clean the sealing grooves and mating surfaces before reassembly to prevent pinched O-rings and repeat leaks.
• If you remove the impeller, replace the mechanical shaft seal during the same service.

Related Products (Aqua Pool Supply)

• Sta-Rite U9-226 diffuser O-ring
• Sta-Rite Dura-Glas mechanical shaft seals
• Sta-Rite Max-E-Glas mechanical shaft seals
• Sta-Rite Dura-Glas lid O-rings
• Sta-Rite Max-E-Glas lid O-rings

Maintenance Tip

If you see small air bubbles in the pump basket or notice slow priming, inspect the lid O-ring first, then check the diffuser O-ring and diffuser seating surfaces during your next service. Keeping seals clean and properly seated helps protect the diffuser, impeller, and shaft seal from premature wear.