This is a Super Soaker Quick Fill Device, or QFD. You would attach it to your hose (presumably at your standard house pressure of 30-50 psi), and stick the nose of your CPS blaster in it. That presses down the button, and allows water to flow out. In essence: IT'S A GIANT BLAST BUTTON.
3/4" SDR 21 PVC
3/4" PVC caps (flat ones)
1/2" PVC plug
First, assemble the bottom as shown. A 5/8" hole was drilled in the side, for the CPVC to sit in. Further, the CPVC has been shaved to the contour of the chamber, so as to not inhibit piston movement.
The rest of the chamber: the top 1/3" to 1/2" of a cap, a 1/2" plug (outside ridges shaved down), sealing surface, and a weak spring. Enough to seal the piston, but not much more.
And fully sealed up. Once you get it moving initially, the air comes out, and it gets much easier to push in the rest of the way. Kinda like pulling a pin on a 2K.
Edited by Buffdaddy, 10 July 2011 - 01:18 PM.