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
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Manufacturer: Pentair / Sta-Rite
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Part Number: C1-200PA
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Common Alternate Marking: C1-200PAZ (diffuser variant/marking commonly used for the same style application)
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Part Type: Pump diffuser
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Typical Pump Families: Sta-Rite Dura-Glas and Max-E-Glas
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Diffuser O-Ring (commonly used): U9-226 (sold separately)
Common Compatibility Range
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Dura-Glas: commonly used across mid-range horsepower configurations within the Dura-Glas series
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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
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Vane design: 5-vane diffuser style commonly used on these wet ends
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Mounting: 5 screw-hole pattern (typical for this diffuser style)
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Inlet sleeve: brass sleeve at the intake (common identifying feature)
Approximate Dimensions
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Overall diameter: ~6-1/2"
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Front-to-back depth: ~1-7/8"
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Thickness (outer edge): ~9/16"
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Inlet ID: ~1-7/8"
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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)
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.
