for different motors, i have a bunches of 2 st motors form .55 -1.20 .the .55 uses a 1/4" stinger tube , the 1.20 uses a 5/16 stinger tube . i make all my budlight mousse cans with a 5/16" stinger tube and sleve down the stinger tube for the size of motor i'am going to use . a universal mousse can . you need a 9/32 " sleve to reduce from 5/16" down to 1/4" .