Modification from original: 1) Added detents to hold valve in opened and closed positions. 2) Changed 'bearing' to align with vacuum flow (so, no more misaligned 'lever'). 3) Changed end "tubes": one end will slip into a female PVC fitting, and a hose/clamp will fit over other end. 4) Added small seal to help stop leaking at seam where the "cases" get joined together. --------------------