How to Replace the WaterPORT Pump Seal and Stop Leaks
By Klymit - Official Site | Lightweight Camping Gear | Published: 2026-10-31
Category: How-to Guides
A slow or leaking WaterPORT hand pump often traces back to a worn pump seal. Follow these steps to replace it in minutes and get back to full pressure.
Quick answer
Replace the pump seal by unscrewing the pump cap, prying out the old seal, pressing the new WaterPORT Pump Seal into the cap, and reassembling. The whole job takes under two minutes and usually restores full pressure.
Why the pump seal fails and how to spot it
The pump seal sits inside the pump cap and creates the airtight seal that lets the hand pump build pressure. Over time, grit, sun exposure, and repeated pumping can wear or nick the seal, causing air to escape. If your pump feels spongy, takes far more strokes than usual, or you see water seeping around the cap, the seal is the likely culprit.
Before ordering a replacement, rule out a loose cap or a clogged hose. A quick visual inspection of the seal for cracks or flattening will confirm whether replacement is needed.
When to replace vs. when to clean
A seal that is simply dirty or has debris trapped against it can often be cleaned and reused. If the rubber is still pliable and free of tears, rinse it and reinstall. Replace the seal if it is cracked, hardened, permanently deformed, or if cleaning does not restore pressure. Keeping a spare seal on hand is cheap insurance for longer trips.
Step-by-step pump seal replacement
- Release pressure and remove the pump cap: Make sure the tank is depressurized. Unscrew the pump cap from the tank by turning it counterclockwise. Set the cap on a clean, flat surface. If the cap is stuck, check for a locking tab or ring before forcing it.
- Remove the old seal: Use your fingers or a blunt tool like a spoon handle to pry the old seal out of the cap. Work gently to avoid scratching the plastic. Do not use a sharp screwdriver, which can gouge the sealing surface.
- Clean the seal groove: Wipe out any dirt, sand, or old rubber residue from the groove inside the cap. A clean groove helps the new seal seat properly. A cotton swab or soft cloth works well for reaching into the groove.
- Install the new WaterPORT Pump Seal: Press the new seal into the groove, making sure it sits flat and evenly around the cap. It should fit snugly without any twists. If the seal bulges or will not sit flat, remove it and reseat it; a twisted seal will leak.
- Reassemble and test: Screw the pump cap back onto the tank until hand-tight. Pump a few strokes and listen for hissing or feel for air escaping around the cap. If pressure still does not build, check that the cap is fully threaded and the seal is not pinched.
Product facts
- Pump Seal: The WaterPORT Pump Seal is designed to increase efficiency by 50% and reduce the number of pumps required by 50%. You will spend less time pumping and more time rinsing gear or cleaning up.
Pump Seal - Pump Seal: Installation takes less than 2 minutes and fits inside your existing pump cap. No special tools are needed, and you can replace the seal trailside or at home.
