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.
