Check Valve(s) needed for Windshield Washer Nozzles?, .. using an electric pump Options

[Literati914]

Trying to wrap my head around the PET illustrations for the windshield washer pump.. There is an illustration for an electric pump which is what I'll be using, however it seems to only call for "T" pieces - but I believe that's being shown with the early chrome nozzles.

Did maybe early nozzles incorporate a check valve, but the later black one didn't?

The illustration for the later black nozzles lists a "T" shaped "valve with valve" (probably a separate check valve, no?).

Anyone know what's what here?


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[Literati914]

The black nozzles I have are new and unused, so I'm gonna use them for the time being.

I just realized that the model number for the early nozzles (chrome) are described in the first PET illustration as as "Spray Nozzle" and the same model number in the second illustration is described as "Spray Nozzle with Valve" ... the later nozzles are just described as "Nozzle Black" - so it's a pretty good indication that separate check valves were used with the late black nozzle set up.

[Retroracer]

I just realized that the model number for the early nozzles (chrome) are described in the first PET illustration as as "Spray Nozzle" and the same model number in the second illustration is described as "Spray Nozzle with Valve" ... the later nozzles are just described as "Nozzle Black" - so it's a pretty good indication that separate check valves were used with the late black nozzle set up.

From experience, the early nozzles require the check valves. I fitted an electric pump when I did my -6 conversion, and on one of the first "spirited" test drives was shocked to see clear liquid splashing on the screen! At least I knew it wasn't coolant.... ;-)

Think I looked at the PET for a 911 and found the check valve part numbers - this fixed it.

- Tony