Abstract: Apparatus and method for interconnecting a rubber, fluid-impermeable cup having a wall thickness with a reservoir characterized by an attacher having interference fit with an aperture in the wall of the cup so as to form a fluid-impermeable seal, and a stem and flange over which a short section of rubber tubing is inserted sufficiently to exert a force against the flange the wall of the cup to effect a fluid-impermeable seal joint and a mechanical joint without adhesives. Preferably, the short section of rubber tubing is corrugated so as to allow being being without blocking flow of fluid therethrough and has corrugations extending beyond the attacher so as to not block the bore through the attacher.