Prestaflator Rebuild Kit, Bike Pump Accessoires COMPATIBILITY - These o-rings fit the hose, Pressure Release button and Trigger Plunger on a Prestaflator tool. KIT INCLUDES - Kit also includes internal trigger-plunger washers for 2010 and newer Prestaflator tools. MATERIAL - O-rings made from high quality buna-nitrile (BN70) rubber with a durometer rating of 70. RELIABILITY - Updated 2013 Plunger seal is more reliable and gives the tool easier trigger regulation and retro-fits to 2010 and newer tools. QUALITY: Prestacycle isdedicated to putting new ideas and innovations in the hands of cyclists. As life-long cyclists, we understand its about riding and actually being on the ride. We make products to do the right job quicker, and give you more time in the saddle.