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Foster Products

ZSi Products


ISO A Series (Conforms with ISO 7241-1, Series A)
Sizes and Pricing

Sizes and Pricing

Sizes and Pricing

Dust Plug, Dust Cap
Dust Plug/Cap Combination
Material: Rubber


  • ISO A Series couplings feature poppet valves with solid metal perch that maintains valve alignment and prevents flow checking. Both the sleeves of the socket and plug are case hardened to make the couplings resistant to damage from brinelling and mechanical shock.

  • The durable ball-locking mechanism ensures a reliable connection every time.

  • These couplings have female pipe and straight thread end configurations as standard. The dimensional requirements of Series A in ISO 7241-1. Socket and plug are interchangeable with other parts compatible with ISO 7241-1.

Applications:The versatile ISO A Series couplings are used in a wide range of hydraulic applications including construction equipment, manufacturing machinery, and in-plant systems. They can be found anywhere the fluid transfer lines need to be connected and disconnected for operation or maintenance of equipment. Rugged construction makes it a good choice for mobile applications including dump trucks, snow plows, refuse hauling, mining, asphalt paving, truck trailer connections and many more. In-plant machinery applications include hydraulic fluid, chemicals and gas lines for paper mills, steel production, and many varieties of plant maintenance and production equipment.

Note: Foster approved components (May be imported)


Rated Pressure (PSI) / Working Pressure:

  • 1/4"- 5,000

  • 3/8", 1/2", 3/4", 1" - 4,000

Temperature Range (std seals): -40° to +250° F.

Interchangeable Couplers For Non-Standard Designs
Related Non-Standard Interchange

As various manufacturers started to offer quick detachable couplers, most of them entered the market with their own design, which was different from their competitors. There was very little interchangeability from one brand to another. Efforts to correct this problem began about 50 years ago with the creation of a military specification (MIL-C-4109) for One Way Shut-Off couplers. This design is now the most commonly used and is referred to as the standard industrial interchange. Two Way Shut-Off designs are also being standardized, based on ISO dimensions. However, there are still many different Two Way designs, most of which vary by application. Although there is no organizational standard governing the design of Straight-Thru couplers, a standard industrial design (Foster Series FST) has developed from usage. Foster offers couplers that will interchange with many of these non-standard designs as shown below.

One Way Shut-Off Couplers

Two Way Shut-Off Couplers

Straight Through Couplers

Mold/Die Couplers

  • FJT Series Interchange with DME, Jiffy-Tite, Jiffy-Matic, Parker Moldmate