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JP18 Union Ends

JP18 – Twin Sphere Rubber Bellows Union Ends. JP19 – Single Sphere Rubber Bellows Union Ends.


Union ended rubber bellows consisting of synthetic fibre reinforced body with E.P.D.M. liner and cover fitted with galvanized malleable iron female B.S.P. union ends.


Stourflex union ended rubber bellows are designed to offer a simple method of connecting small bore pumps and air conditioning equipment and are used to reduce noise and vibration. They are suitable for use on chilled water and low pressure heating systems.

  • Maximum working temperature 82°C.
  • Maximum working pressure 6 bar.
  • Stourflex union ended rubber bellows should not be used at their maximum working temperature and pressure respectively.
  • Maximum test pressure = 1.5 x working pressure or 1.5 x end connection rating, whichever the lower.


*We would not recommend the insulation of rubber bellows being used on hot water or heating applications as this can drastically reduce the life expectancy of the bellows leading to premature failure.

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JP18 and JP19 ruber bellows

our technical specifications

Our JP18 Union Ends specifications

Part numberN.B. (mm)Minimum Installed Length (mm)Maximum Installed Length (mm)Minimum Cold Test Pressure (bar)Maximum Cold Test Pressure (bar)

Supplied length may vary. Tolerance +/-5%

Where vacuum conditions or temperatures and pressures above those stated exist please check with us the suitability of and effects on service life of Stourflex products.

For applications where larger sizes of equipment require isolation please refer to the Stourflex range of flanged stainless steel pump connectors and rubber bellows.

Stourflex products should be installed in accordance with our fitting instructions.

Stourflex union ended rubber bellows should be periodically inspected and replaced if any deterioration is evident.

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