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: 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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