Proco Products, Inc.

P.O. Box 590
Stockton,  CA  95201-0590

United States
  • Booth: 4618

Proco Products, Inc. is a major supplier of rubber and PTFE expansion joints for piping and ducting systems. In addition we also offer wall penetration seals and rubber duckbill check valves.

 Press Releases

  • Proco Products, Inc. is excited to announce the release of a useful tool to help aid in the proper selection and installation of pipe penetration seals (Pen-Seals) into a piping system. The Proco Pen-Seal Calculator is designed to assist in selecting the correct number of links and the correct size of link for pipe penetrations passing through walls or floors. To achieve a 100% water or gas tight seal, enter in the pipe O.D and the penetration I.D. to provide the required size/link combination.

    What exactly is a Pen-Seal? Pipe Penetration seals have been designed to assist in achieving an efficient, low-cost mechanical seal when piping passes through walls, floors, tanks, pipeline castings or vaults. The unique design of the Pen-Seal helps to provide a gas or watertight seal, filling any space around a pipe. The standard elastomer for the Pen-Seal is EPDM and can be used in various applications in Power-Gen, HVAC, Water & WasteWater, Mining, etc.

    Within in the new Pen-Seal Calculator, you can also access the company website, view the Pen-Seal brochure PDF, contact a Proco representative and view an installation video. This video gives you a step-by-step visual of how to properly install a Pen-Seal from Proco. We encourage you to download this exciting & useful tool today on the appropriate platform for your device.

    iOS -
    Android -
    Installation Video -

  • Proco Products, Inc. is very happy to announce that they have received NSF/ANSI 61 Certification on their EPDM Spool-Type expansion joint product line. NSF/ANSI 61 standards were developed by the National Sanitation Foundation (NSF) and the American National Standards Institute (ANSI) and relates to water treatment which establishes stringent requirements for the control of equipment that comes in contact with either potable water or products that support the production of potable water. If you are involved in the manufacture, sales or distribution of potable water or products, you are required to comply with NSF/ANSI 61: Drinking Water System Components – Health Effects.

    Proco Products, Inc. has NSF/ANSI 61 certification on the following expansion joints in EPDM only:

    These certified expansion joints are available in sizes 1” I.D. thru 120” I.D. (Note: For sizes less than 8” diameter, no more than one joint per 175 feet of pipe shall be used). All of the certified products will be supplied with labels to identify them as NSF/ANSI 61 Certified. Please visit for more information or contact a Proco representative at (209) 943-6088.