Quick Start Cylinder Bottom Seal Solution
As any of you know who have purchased the ProQuatics Deluxe Gravel Vacuum cylinder, the bottom edge (the part that you press into your pubic area) is quite rough right out of the package. Some here have flared the tube using heat, others have glued cushions to the bottom, and some have dipped the tube in Plastidip to fashion a cushiony seal at the bottom. I didn’t want to fuss with stoves, flames or glue so I searched the plumbing aisles of Lowe’s and Home Depot for some type of rubber seal that would slide over the end of the cylinder tube.
I finally found something close to what I was looking for at Home Depot. I purchased a Proflex Specialty Coupling by Fernco, part number 3001-150. This consists of a cylindrical rubber coupling surrounded by a wide metal adjustable band clamp (it’s intended use is to join “1 1/2” CI, PL or St to 1 1/2” Copper or 1 1/4” PL”). I pulled the rubber coupling out of the metal band clamp and slid it over the end of the ProQuatics cylinder. It was a perfect tight fit. No flames, no glue, no waiting for Plastidip to dry. The coupling was priced at $6.42 plus tax. I purchased the coupling, took it home, set aside the metal band clamp (not needed for this use that Fernco never contemplated) and could instantly start pumping in comfort.
The rubber coupling has a inside ridge at the halfway point that serves a stopping point for sliding the coupling onto the tube. I selected part number 3001-150 because it had a thicker flat-edged cylinder wall on one end that would provide more cushion.
The rubber coupling provides a fantastic seal. However, overall, this is a satisfactory solution, at best. There are two inside ridges on the thicker end of the rubber coupling and then the center inside ridge at the halfway point. After you pump up in the tube, these three inside ridges leave temporary lines on your dick shaft and you can also slightly feel the center inside ridge while pumping. For those looking to slightly decrease the diameter of the ProQuatics cylinder at the base, this is an easy way to do that. The rubber coupling has served me well the past few weeks until I get some workshop time to try the Plastidip seal solution.