Oil tight hole seals are used to cover conduit or push button holes as well as seal any openings to prevent dirt, water, dust, and oil from entering an enclosure. Sierra Pacific Engineering and Products oil tight hole seals come in various sizes, able to cover holes with diameters ranging from 3/16” to 4 5/8”. We now offer Oil tight hole seals in different materials and finishes. If you need superior corrosion resistance – try SPEP’s 316SS hole seals. These robust materials ensure the durability of the seals in different environments. Each set includes a cap, an oil-resistant gasket, a backplate, and a wing nut. All Sierra Pacific Engineering and Products Oil Tight Hole Seals are UL 508A Recognized components.