It's a B&Q Performance Power brand jet washer
PRO 1600 PWA and not a
PRQ 16000 PWA - but no matter
Water gushes from the handle - the carrying handle?
If so invest in a new one
If water gushes from the wand then get a new wand - I think Amazon sell them - also Performance Power spares from Solent Tools 023 8057 8057
Good Luck..., August 2016