Pay the 15 pounds and rebuild the pump and make it your last loss. Next week you might be trying to buy the valves separately
Can I buy the gauze filter on it’s own?
An internet search only shows a complete rebuild kit, which at £15 isn’t out of the way, but it seams a waste of the other parts.
Mine got totally blocked which distorted the filter.
This is the one I am afterView attachment 1011492