Titan 704-289 Piston Bushing 

This bushing holds the lower packings in place in many of the smaller Titan units.  This is a list of most of the units that it 

fits:440i, Xi345, 440XC, 440 Impact, 540ix, 640i, 640ix, 440ix, 640 Impact, 440 HPX,  Xi445, SprayTech 2155, SprayTech 2255, SprayTech 419