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Our standard 4000 Series Corrosion Test Coupon By-Pass Systems are available with one to six coupon holders and have both inlet and outlet isolation ball valves. They are available in a choice of four materials: Sch 80 PVC, suitable for most applications; CPVC, for applications requiring moderately higher temperature; Carbon Steel and Stainless Steel for high-temperature
applications. The PVC and CPVC bypass systems are mounted on a high density polyethylene mounting board.

All piping and valves for the bypass are to be either ¾ or 1 inch.

Made in the USA.


  • Cooling Towers
  • Chillers
  • Boilers
  • Heat Exchangers
  • Condenser Units

Construction Materials Available:

  • Black iron
  • CPVC
  • PVC
  • 304 stainless steel
  • 316 stainless steel


  • Custom configurations and materials
  • Back flow check valves
  • Flow control valves
  • Flow indicators
  • Y-strainers
  • Test dample valves

1. Test specimens must be handled carefully to avoid coating with natural oil from the skin, thread compound or any similar material.

2. When removed, each specimen is to be carefully disconnected from the holder and then immediately dried with hot air or by sponging with a paper towel. Do not clean or remove any residue that may be on the coupon. Insert the specimen in the original envelope or wrap in cellophane. Enclose the test coupon data card showing company name, locations of the bypass, specimen number, date of installation and date of removal. Promptly mail to the Eddington Group for analysis.

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