Description Description The Haskel 55020-21 seal kit is a high-quality replacement part for your Haskel liquid pump, gas booster or air amplifier. This seal kit is designed for the M-21 model, which has a pressure ratio of 21:1 and a maximum outlet pressure of 3150 psi. The seal kit contains all the necessary seals, bearings and other parts to ensure optimal performance and service life of your Haskel equipment. The seal kit is easy to install with the help of the seal kit instruction sheet that matches your model. The Haskel 55020-21 seal kit is the best way to protect your investment and maintain the reliability of your Haskel high pressure technology. State of California Proposition 65 WARNINGCancer and Reproductive Harm - www.P65Warnings.ca.gov. Literature & Docs Accessories