Description
When you’re mixing up chemicals for the day and you’ve got a sprayer tank that won’t seal right, you’re looking at lost pressure, wasted chemical, and maybe even a mess in the truck. This screw cap keeps your Solo backpack sprayer sealed tight so the pump can build the pressure you need for consistent spraying. No more having to pump twice as much to get half the pressure.
What You’re Getting
- Tight seal that holds pressure so your sprayer works like it should
- Durable threads that won’t strip out from regular use
- Chemical-resistant construction that handles herbicides, pesticides, and fertilizers
- Direct replacement that screws on just like the original
Built for Real Farm Work
This cap fits both the Solo 425 and 475 backpack sprayers, the workhorses you see around farms everywhere. Whether you’re spot-spraying pastures, treating fence rows, or handling garden pest control, these sprayers need a cap that can handle the pressure and the chemicals you’re putting through them.
Made to Last
Farm chemicals are tough on equipment, and caps take the brunt of it since that’s where you’re filling and where pressure builds up. This one’s built to handle the temperature swings and chemical exposure that come with regular spraying jobs. The seal stays flexible and keeps doing its job season after season.
Good to Know
Installation is straightforward—just unscrew the old cap and thread on the new one. If your old cap has been on there a while and won’t budge, a little penetrating oil around the threads makes removal easier. Check that the tank opening is clean before installing the new cap to ensure a good seal.


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