Abstract: A piston is provided with a gapless ring positioned in a subport position. Specifically, the gapless ring is positioned between the air ports and the crankcase of the engine. The gapless ring includes a rail and an annular ring received within the rail. The ring includes a ring gap and the rail includes a rail gap. When the rail receives the annular ring, the ring gap and rail gap are spaced apart in a circumferential direction such that the gaps do not overlap. In certain embodiments, the rail includes a notch. When the annular ring is received within the notch, the annular ring and rail are biased against rotating with respect to each other. In certain other embodiments, the gapless ring includes an oil scraping surface.

Abstract: A hanger to adjustably suspend a chemical dispenser from the rim of a tank comprising a hanger member and a retaining sleeve therefore integral to the dispenser, the hanger member being positionable at discrete levels, which hanger member is substantially non-removable from the sleeve once inserted. A pair of shoulders in the hanger member cooperate with shoulders in the sleeve to prevent removal of the hanger member. Should the hanger member be removed, misuse is prevented by providing the hanger member with a resilient bottom portion that is substantially incapable of puncturing or prying open the chambers containing the chemicals to be dispensed. In a preferred embodiment, a second anti-removal means is provided in the hanger comprising a pyramidal indent in the sleeve and a ramp type stop member in the hanger member.