ok first you need to take off the fitting from the body...closest one to the eye. then take it off from the hose and you might need to trim off maybe 1/8 of in inch off the hose. then it takes some time but you have to put the end of the qev in the hose. i used a little grease to put it in. and you have to put it all the way in and then the only way to see if its right is put it all back together and put air in it.