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Self serve plumbing questions?

cap732000

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Apr 7, 2014
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oklahoma
Ok I was at my newest wash today and when I walk in the door every single tank soap and rinse tanks were overflowing. Couple questions about this. 1. Why did they take a elbow out of
Every bung in the back and tie them all together and they absolutely go nowhere but the other tanks they did drill a small hole in top of each elbow when it came out. Can anybody explain what the use for that is never seen it before and basically if a hydrominer or check valve goes bad it just overflows every tank instead of one? And second looking at plumbing on this thing they they tied the cold and the hot together with a swing check to keep the cold from backing into
The hot which is something else I've never saw and can't understand what on earth would be the reason for this. I have my sawzall ready if somebody can't explain this.
 
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