Pentair 1/2 HP Full-Rated 3/4 HP Up-Rated Diffuser | C1-216P
Pentair
SKU: C1-216P
Pentair / Sta-Rite Diffuser for Dura-Glas & Max-E-Glas Pumps (1/2 HP FR to 3/4 HP UR) | C1-216P (5056-10A)
The Pentair / Sta-Rite C1-216P is a replacement pump diffuser used on select Sta-Rite Dura-Glas and Max-E-Glas inground pool & spa pumps. The diffuser mounts over the impeller to help guide water flow out of the impeller, improving hydraulic efficiency and helping the pump build steady pressure. Replace it when the original diffuser is cracked, warped, worn, or damaged from debris or freeze conditions.
Compatibility
- Fits: Sta-Rite Dura-Glas and Max-E-Glas pump models that use the C1-216P diffuser
- Horsepower range (common application): 1/2 HP Full Rated through 3/4 HP Up Rated versions of the Dura-Glas/Max-E-Glas series
- Tip: Match your pump’s parts diagram to confirm C1-216P / 5056-10A is the correct diffuser for your exact model and revision.
Key Features
- Direct replacement diffuser for compatible Sta-Rite Dura-Glas / Max-E-Glas pump wet ends.
- Restores proper water flow path from the impeller to the volute for more consistent performance.
- Helps protect the wet end by maintaining correct internal clearances when the old diffuser is worn or damaged.
- OEM-fit geometry to reduce vibration/noise caused by warped or cracked diffuser parts.
Specifications
- Brand: Pentair / Sta-Rite
- Part Number: C1-216P
- Catalog / Cross Reference: 5056-10A
- Part Type: Pump diffuser
- Approx. Size: 6-3/8" L x 6-3/8" W x 1-3/4" H
- Quantity: Sold individually
Common Signs You Need a New Diffuser
- Reduced flow/pressure after confirming the basket and filter are clean
- Rattling, vibration, or unusual wet-end noise
- Visible cracks, chips, or heat/freeze warping on the diffuser
- Diffuser-to-impeller rubbing marks or excessive internal wear
Installation Notes
- Turn off power at the breaker and relieve system pressure before opening the pump.
- Inspect the diffuser O-ring and sealing surfaces—replace worn O-rings to prevent air leaks and drips.
- Clean debris from the volute and impeller area before reassembly.
- Reassemble evenly and confirm the impeller spins freely by hand before restoring power.
Related Products
- Search Aqua Pool Supply for C1-216P
- Search Aqua Pool Supply for 5056-10A
- Diffuser O-Ring (U9-226)
- Sta-Rite Max-E-Glas pump parts
- Sta-Rite Dura-Glas pump parts
- Pump seal kits
- Silicone lubricant for O-rings and seals
Maintenance Tips
- Keep the pump basket and skimmer basket clean to reduce debris damage to the impeller and diffuser.
- If you open the wet end, replace the key O-rings/seals at the same time to avoid suction leaks after reassembly.
- Protect the pump from freezing—ice expansion can crack diffusers, volutes, and seal plates.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 8:00 am to 4:00 pm Phoenix Time
Saturday and Sunday: Closed
- Orders costing more than $300 WILL be required to have signature confirmation upon delivery.
- Handling time is typically only 1 day.
- Any item ordered after 1pm Phoenix time, may not ship same-day.
- Call us if you require expedited shipping and we can give you quotes based on your needs.
Return Policy:
- All products, except as noted below, are eligible for return up to 30 days after receipt of item.
- For returns, an RMA form must be filled out HERE or customers can call for additional help.
- Shipping costs will be deducted from all returned items.
- Any item that is missing accessories, original packaging, or is not returned in the same condition that it was received in, may be subject to a re-stocking fee up to 100% based on the condition we receive it in.
- Items broken, damaged, or inoperable due to installer error will not be refunded.
- Fill out the return form or give us a call to obtain an RMA and return shipping label.
- There are no returns on the Pentair Colorsync 618031
- No returns on pool cleaners.
- No returns on opened seals and o-rings.
- No returns on capacitors.
- If a light is returned because it "doesn't work" and it tests fine, the cost to ship and a re-stocking fee will be deducted from the refund.
- All products denied upon arrival at customers house WILL be charged the cost to ship.
- Visa Gift Card Promotions: Gift cards are sent within 14 days of the order. When accepting the Visa Gift card, you agree that if your order is returned or refunded, this amount will be deducted from the refunded amount. All Visa Gift cards are sent via email in an E-Gift Card format and are non refundable.
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