The most important factor in properly sizing couplers is flow.  The media flowing through the coupler will usually determine the type.  Compressed air, many other gasses, and some liquids can be handled by One Way Shut-Off couplers.  Hydraulic fluids as well as many other liquids and some gasses require Two Way Shut-Off.  Straight-Thru couplers are suitable where there is no pressure in the line at connect or disconnect and loss of media at disconnect does not matter.

How to Select - Proper coupler selection is important because of the variety of media for which they are used.

Current Foster Price List

	One Way Industrial Interchange		One Way Non-Standard Interchange
	Two Way Shut-Off Couplers		Straight-Thru Couplers
	Mold & Die Coolant Couplers		Accessories

   Fluid Compatibility Guide