A universal device for capping and mounting a motor within a motorized pool cleaner housing that allows a motor pump to be installed in different brands of pool cleaners and used at increased depths underwater. An improved motor can seal has an outer seal having a first diameter, an inner seal having a second diameter and an intermediate seal connecting the outer seal to the inner seal where the inner seal is tapered towards the distal end of the inner seal. An improved motor shaft is used having a head section, a body section and a seal area, wherein the seal area is hard chrome plated.