Tom,
I don't think that's a dump valve version. The dump valve has three ports. One is air in, one is air out to the bags, and one is valved to a dump solenoid. I only see air in and air out on the picture.
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Richard Rhonda Ty and Alex Entrekin
1995 Newell # 390 DD Series 60, Allison World Trans
Subaru Outback toad
CoMotion Tandem
Often wrong, but seldom in doubt
Rhonda's chronicle https://wersquared.wordpress.com/
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