I need a new windshield washer hose "check valve" (pictured below) for my '83 512BBi. Ferrari UK doesn't even show it in their parts listings and neither of the two F dealers I've talked to show it either. Maybe someone installed it later? Both dealers said they had a gray colored Alfa one that might work... Anyhow, I was able to take the top off of it and the rubber plunger inside has deteriorated, so the water now flows through it even when the pump isn't on and this causes the cleaner fluid to dribble out the windshield sprayer nozzles when the car is going up/down hills or accelerating hard. Does anyone recognize it?