Patent ID: 8905723

Claim:
A marine jet pump comprising of a housing, a ring and a collar; the housing contains an impeller that is substantially coaxial to the collar and the ring; the ring at a forward end is affixed to an aft end of the housing; at an aft end of the ring is an inside diameter; the inside diameter is naturally biased to a dilated state; the aft end of the ring is annularly compressible to reduce the inside diameter to a constricted state; the collar at a forward end is larger than an aft end; the aft end of the ring is dimensioned to engage into the forward end of the collar; in a constricted mode the collar is selectively operated to engage around the aft end of the ring to a predetermined distance to annularly compress the inside diameter of the aft end of the ring into the constricted state; in a dilated mode the collar is selectively operated to disengage the collar from the aft end of the ring to a predetermined distance so that the aft end of the ring is in the dilated state.