Lezyne has gone through several generations of our pump chuck designs.
The Original Flip Chuck
In model year one (Y1), Lezyne introduced the Flip Chuck. Made of a solid piece of CNC machined aluminum, it quickly switched from Schrader to Presta by un-threading the chuck from the swivel/hose-connector and flipping it 180 degrees. It was very robust and only after considerable usage did it need a replacement O-ring for continued use.
It attached to the hose via the original swivel, which was also CNC machined aluminum.
This was thread-locked in place, but could occasionally un-thread during use. It was redesigned as a result to require a 2.5mm hex to remove it from the hose.
The ABS Flip Chuck
As durable and robust as the original Flip Chuck was, if it was over tightened, it could unscrew a loose valve core, so in Y4 we redesigned the Flip Chuck to include an air bleed button. This allows the user to break the air seal on the valve before unscrewing the chuck. When the valve core is tight and the chuck isn't over tightened, it prevents the chuck from unscrewing the valve core.
Around the same time, the swivel got a redesign as well. The second generation could occasionally bind against itself and leak, so the swivel was redesigned to be half composite matrix and half CNC machined aluminum. We also changed the 2.5mm hex key hole to a 4mm hex key hole for removing the swivel from the hose.
In Y9 we introduced the ABS-2. It had a number of advantages: it handled both Schrader and Presta at the same hole, completely released from the valve core when being removed, included a 90 bend, and the ABS button could bleed from the tire.
Some users found it a little too complicated to use, and it was a little harder to maintain with many more moving parts than previous chucks. For Y11, we discontinued the ABS-2. Unfortunately as of 2019, we are no longer able to provide replacement parts for this chuck. You can reach out to the Support Team by submitting a request for guidance replacing your chuck.
The ABS-1 Pro
For Y11, Lezyne returned to our original connection style. The replacement for the ABS-2 would keep most of the improvements in design of the ABS-2, with the simplicity and reliability of the threaded connection. This led to the design of the ABS-1 Pro, which is what our current pumps ship with.
High Volume Chucks
Starting with the ABS Flip Chuck, there was a corresponding high volume version of each chuck - each anodized a different color to distinguish them between high volume and high pressure.
The ABS Flip Chuck HV and its bespoke swivel
The ABS-2 HV
For users that have threadless valve extenders or a very small space to attach to the valve, we offer the Slip Chuck. It attaches to the swivel in place of the Flip Chuck or ABS Flip Chuck.
We also offer a basic flip-lever chuck that we call the Dual Valve Head. Some of our entry-level pumps ship with this chuck.
All of our High Pressure pumps continue to use the same hose size. As we've released different chuck options over the years, they all remain backwards and forwards compatible.
We have three different hoses: the High Pressure hose, the Braided High Pressure hose, and High Volume hose. All of our High Pressure chucks are compatible with our High Pressure hose and Braided High Pressure hose, and all of our High Volume chucks are compatible with our High Volume hoses.
Note: The feet on the base of our High Pressure pumps says both "High Pressure" and "High Volume." Our High Volume pumps say "Lezyne" and "Precision High Volume."
If you are having any problems with your chuck or have nay further questions, please submit a request to our support team for help.