It is in the top of the sprayer pump. The easiest way to check it is to put
a few drops of oil in the top and let the O ring soak it up. Maybe it will
hold pressure then (you may have to do it a couple of times). You are
supposed to do that every year, sometimes twice a year (at least on the
sprayers I buy). The most important thing is to wash the sprayer each time
you finish using it. Rinse it out several times, then put clear water in
them, pump them up and spray clear water through the entire sprayer for
several minutes. Then I turn it up side down and let it dry completely, set
the sprayer pump inside the canister hole, and put it away

Dwayne

"Jen" wrote in message
...
Why is it that whenever I get one of those pressure sprayers, they either
don't work when I get it or stop working soon after? It's the actual
pressure valve, it lets the pressure out while I'm actually pumping it.

Does anyone know what's going on here?