Pentair D Series Pump Gasket Adapter | C20-46
Pentair
SKU: C20-46B
Pentair Gasket, Adapter (D-Series Pump) | C20-46 (C2046)
The Pentair C20-46 (often typed as C2046) is an adapter gasket used with select Pentair D-Series self-priming centrifugal pool and spa pumps. This gasket seals the adapter/flange interface to help prevent water leaks and air intrusion that can affect priming and pump performance.
Key Features
- Adapter gasket for Pentair D-Series pump assemblies (seals the adapter/flange joint).
- Restores leak-free sealing when the original gasket is flattened, cracked, or torn.
- Helps prevent suction-side air leaks that can contribute to bubbles, loss of prime, or noisy operation.
Compatibility
- Fits: Pentair D-Series self-priming centrifugal pool and spa pumps (where the parts diagram specifies C20-46)
- Tip: Confirm your exact pump model and parts diagram—D-Series assemblies can vary by revision.
Specifications
- Brand: Pentair
- Part Number: C20-46 (C2046)
- Catalog Reference: 5058-07
- Outside Diameter (OD): 9-1/2"
- Inside Diameter (ID): 8"
- Approx. Thickness: 1/4"
- Quantity: Sold individually
Common Signs You Need This Gasket
- Water seepage at the adapter/flange area
- Air bubbles visible in the pump basket (after confirming water level and basket lid O-ring are OK)
- Loss of prime or intermittent priming issues tied to suction-side sealing points
- Gasket looks compressed, cracked, or breaks apart during disassembly
Installation Notes
- Shut off power at the breaker and relieve system pressure before opening any pump connections.
- Remove the old gasket and clean both mating surfaces thoroughly (remove old gasket material and debris).
- Install the new gasket flat and evenly seated—do not stretch or fold.
- Reassemble evenly and avoid over-tightening hardware to prevent distortion or future leaks.
- Restart and check closely for drips and air leaks during initial run-up.
Related Products
- Search Aqua Pool Supply for C20-46
- Search Aqua Pool Supply for 5058-07
- Pump seal kits
- Pump gaskets and O-rings
- Silicone lubricant for O-rings and seals
Maintenance Tips
- Any time you open a gasketed joint on an older pump, plan to replace the gasket—reusing compressed gaskets often leads to leaks.
- Keep suction-side connections airtight; even small air leaks can reduce prime stability and overall pump performance.
- Support plumbing to reduce stress on pump housings and adapters, especially if the pad settles or plumbing is misaligned.
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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