Many thanks to all....
I have done a successful 'cowboy' job!
Bought a 4mm Y connector, a 4mm cap and extra piping, for about £4 on eBay.
Made a 30mm pioe for top of Y, to connect to pump motor.
Pulled both old pipes from pump motor and fitted them to the Y, capped the rear screen feed on pump motor, then fitted the Y onto pump motor. Fairly tidy job.
Result is a bit better than expected! Long pulls for front screen is still powerful, but I get a strong drizzle of water down the rear screen, which is easily enough to clean it with!
BUT I can also do numerous short pulls for front screen and no water gets wasted onto rear screen when I don't need it!
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