ET 4 | Trim installation Slide Q-vying (1) over cartridge and the bonnet nut (23. The O-ring, which acts as 2 spacer to steady the sleeve, should rest behind the bonnet nut, if your mode! requires a spacer (3), insert it into the sleeve (4) and push it fo the front. Slide the sieve over the cartridge, body and O-ring. Using an Allen wrench to secure the sel straw {1}, install the handle (2) ono the stem, insert plug bunion (3) {f our mods! has one} undo set screw hols.