Rubber and Threaded Caplugs

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rubber caplugsRocket Seals, a leading seal and O-Ring specialist, supplies caplugs for all industrial applications.  We serve the OEM, MRO, and distributor markets. Used to protect tubing, threaded and machined parts, fittings and O-Ring ports, caplugs are molded plastic pieces that fit over or inside the part. We supply a wide range of configurations.

  • Static dissipative caplugs providing positive ESD and physical protection for threaded electrical and electronic connectors and non-threaded bayonet-type connectors. Available in all common sizes.
  • Button plugs are used to fill holes in sheet metal for car bodies, tanks, and other large parts. Available in recessed head and flushed head configurations.
  • CD style caps seal flared JIC threads, protecting against moisture, dirt, and residue during painting and plating.
  • FP style finishing plugs fit flush in square tubing to protect against dirt and moisture, and keep sharp edges safe.
  • J style tear-tab caps provide secure seals for NPT pipe threads. They remain locked in place until the tear-tab is pulled to break the seal.
  • P style plugs seal NPT-threaded pipe fittings to protect the port from moisture and contaminants.
  • PC style heavy wall polyethylene caps protect threaded pipe ends from moisture, debris, and rodents and from damage during handling.
  • Threaded plugs are available in 5 styles to fit a range of fittings, O-Ring ports, and tube and nut assemblies.
  • RC caps protect threaded connectors, fitting smoothly over threaded and non-threaded cylinders. 
  • RER style plugs fit rectangular tubing with external ribs and fit without creating plastic shavings. They accommodate a wide range of gauges and sizes.
  • SC style sleeve caps for tube ends are smooth covers for threaded and non-threaded tube and rod ends to protect them during painting, plating, and blasting.
  • SF style caps protect split-flange connections. They fit smoothly over the connection and lock while allowing visual access to the O-Ring.
  • SFP style covers protect SAE 3000 lb., four-bolt, split hydraulic flanges by fitting snugly into the opening and cover the flange with an apron.
  • SQR style plugs fit square tubing with external ribs and fit without creating plastic shavings. They accommodate a wide range of gauges and sizes.
  • Tapered caplugs are used as caps or plugs and can be easily removed. 
  • Vinyl caps protect threads and seals against moisture, dirt, and residue during painting and plating.
  • WW style tapered caps and plugs are designed with wide, thick flanges to prevent the plug from being inserted too far. They are ideal for use over MIL Std. and SAE-type tube and hydraulic fittings.

We offer same-day shipping for many parts and perform quality checks of every order, so you know that your caplugs will meet your application specifications.

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