a tool such as a screwdriver the impeller 26 includes fins 25 when the impeller 26 is rotated the fins 25 draw fluid axially across the impeller 26 through the flowpath 70 see fig7 as shown in fig3 and 6 the impeller 26 may include a shroud receiver 60 the shroud receiver 60 is adapted to receive a shroud shaft 29 in operation the shroud 27 and shroud shaft 29 operate to maintain the position of the impeller 26 in the cycling assembly 20 during the operation of the jet assembly 10 it should be understood that the shroud 27 is not necessary for the operation of the jet assembly 10 as shown in fig3 and 4 however the impeller shroud 27 may be received in an interior of the mask 22 to prevent wear on the impeller 26 through excessive movement within the cycling assembly 20 additionally the impeller seat 28 may be coupled to the mask 22 to lock the impeller 26 into position within the cycling assembly 20 the impeller seat 28 may be coupled to the mask 22 by any suitable method such as a j latch a rotational locking mechanism or other suitable means during operation of the water jet 10 the impeller shroud 27 may be static with respect to the rotation of.