Water leaks from around the clear pump lid when the pump is running.

Safety first: Turn off the pump before removing the lid. Do not overtighten plastic lids with tools.

Step-by-step checks:

• 1. Remove and inspect O-ring: Clean the O-ring and lid groove. Look for cracks, flat spots, or stretching.
• 2. Clean sealing surfaces: Wipe the pump housing rim and lid underside to remove grit.
• 3. Lubricate O-ring: Apply a thin film of silicone-based lubricant and reinstall.
• 4. Tighten lid: Hand-tighten the lid evenly until snug. Do not use tools.
• 5. Replace parts if needed: If the lid is cracked or the O-ring will not seal, replace with genuine Davey parts.