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I agree with Pat after a few they become intuitive Don I dont know on the 15 PSI you could lay the hose on the riser stack and wrap it with mule tape tape or you could make a backing peace mirror image of your riser and go with what ever presuere you want only one way to find out 😃
If your only going to 15psi dont invest in a fire hose you could just seal up a intertube cheap those lams look thicker then venere from the pic at 15 psi you might be able to wrap it with para cord ! Could make your whole clamping system for $5 👍🏻
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Hmmm....para chord, a couple bike intertubes, and a hand pump.....now my wheels are rolling....I'm going to test this out.