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had similar happen last year.
replaced the check valve in this line, did not help the sprayer head.
our fix: filled the black tank with as much water as we could, full full full. We were parked, not hauling.
put in a bit of Calgon and laundry soap
let it soak for a long long long time. over night or more.
dumped,
may have done the soaking thing again?? cannot remember, believe so.
after the soaking procedure the sprayer nozzle worked fine and performed as expected.
our take was that there was some tp or mineral deposits hardened on the sprayer nozzle, basically making it non-functional. the soaking removed whatever was plugging the nozzle.
good luck.
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