Our machine is very old, 20+ years if I must assume. The small workhouse is a staple in our shop and we use it almost every day to stamp 20-12 ga stainless steel. The seals leaked horribly and liquid just spilled out of each fitting. This kit (which came with a tooling diagram and parts list) healed our tooling and made it like new. It comes with all required o-rings, gaskets and test balls. This is a complete set! Very satisfied!