Davey Starflo Pool Pump Lid O-Ring (403131SP) – DSF300 / DSF420 / DSF300-1 / DSF400-1

Genuine Davey Starflo Pool Pump Lid O-Ring — part no. 403131SP. This rubber O-ring seals the pump lid (strainer pot lid) to the pump body on Davey Starflo DSF300 and DSF420 series pool pumps. A worn or cracked lid O-ring causes water to leak from around the pump lid. Replacing this O-ring restores a watertight seal and stops the leak.

Compatibility

• Davey Starflo DSF300
• Davey Starflo DSF420
• Davey Starflo DSF300-1
• Davey Starflo DSF400-1

Product Details

• Brand: Davey
• Part number / SKU: 403131SP
• Material: rubber
• Genuine Davey spare part

Frequently Asked Questions

How do I know if this O-ring needs replacing?

If water is leaking from around the pump lid (the clear or opaque strainer pot lid on top of the pump body), the lid O-ring is the most likely cause. Turn off the pump and relieve system pressure, then remove the pump lid and inspect the O-ring for cracks, flattening, or deformation. Even if the O-ring looks intact, if it has been in service for several years it may have lost its elasticity and should be replaced.

Is this the same O-ring as part 402811SP?

No — part 403131SP suits the DSF300, DSF420, DSF300-1, and DSF400-1 models. Part 402811SP suits the larger DSF750, DSF900, DSF1100, and DSF1350 models. Make sure you match the part number to your specific pump model before ordering.

Should I lubricate the O-ring when fitting it?

Yes — apply a small amount of silicone-based O-ring lubricant (not petroleum-based grease) to the O-ring before fitting. This helps the O-ring seat correctly in the lid groove, prevents pinching, and extends its service life.