this invention relates generally to a piston assembly and more specifically to a piston assembly in a prepackaged configuration . the prepackaged piston assembly is ready for immediate installation into an engine or compressor . the piston assembly has a plurality of rings preinstalled on a piston member and a sleeve position about the piston member and the plurality of rings maintaining the rings in a compressed position ready for installation into an engine . the piston assembly is lowered into a cylinder bore , the sleeve contacts the top surface of a block and the piston assembly can be easily installed into the cylinder bore without the need for the mechanic to compress the plurality of rings . thus the present invention reduces time and expense required for rebuilding and engine and increases the quality of the rebuild .