O-ring and bonded seal kits are a necessity for oring_kit_1_LPmaintenance and repairs. Most fluid piping system sizes are measured by dash numbers. For example, a –04 port is 4/16 or 1/4-inch. Dash numbers are usually nominal and are abbreviations that make ordering of components easier Each kit is packaged in an 11” x 1 3/4” x 6 3/4” high strength oil resistant polypropylene box. The inside cover is labeled with individual part numbers, quantities, and descriptions.