Polymer Molding’s new hydraulic plugs are designed to provide a positive seal for SAE straight thread o-ring ports and MIL-MS-33649 bosses. The FFP Series threaded plugs are knurled to protect against contaminants and for easy assembly and removal on fluid power components. An integrated O-ring type bead seals in the bevel of the port to prevent … [Read more...] about Hydraulic plugs provide positive seal to prevent contamination, leakage