Prestacycle redesigned the Presta Grommet in May 2012 to fit to modern standards. PRestacycle's design works so well, it’s been copied by others including major floor pump makers. Prestacycle's design engages the Presta valve just below the cap threads and requires less insertion. The head is now very easy to get on and off, and gives a nice “click” feeling when it’s installed in the right position.
Safe for all types of Presta valves, including tubeless and tubeless-conversion valves. Will not harm newer lightweight performance valves. Fits all Prestaflator BIG Push/pull Presta heads. Also fits all Silca pump heads that use the 24.1 or 242 Gasket.