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Old 10-01-2018, 12:55 PM   #7
Sponge Jockey
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Join Date: Sep 2016
Location: North Wales
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Just an update on this thread, with help of North West Power Washers I've managed to fix the problem. Initially thought it was the none return valve, but kept pulsing after replacing that.

Today I've taken apart the whole gun and found the valve in the handle sticking slightly which caused the valve to stay open en lose pressure. Cleaned and regreased everything which seems to have solved the problem!

Thanks for all the help everyone!

Valve in the handle wasn't properly closing :
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