The Tru-Flate Design Plug is recognized by the extremely short pilot; however, it has the widest metal section between the groove and the pilot. The sealing surface on the end of the plug is wider than other interchanges, resulting in better sealing and longer seal life.T-Style couplers can be identified by one narrow band.
I/M-Style
This plug design has been adopted by most coupler manufacturers. For this reason it is considered the industrial standard. It can be identified by the 3/16" pilot and flat bottom “V”-shaped ball groove. I/M-Style couplers can be identified by two narrow bands.
A-Style
This design is identified by a 5/16" pilot and ball groove which is nearly round. It is similar in appearance to the Industrial. A-Style couplers can be identified by one wide band.
L-Style
This plug is the most easily recognized design. The long 3/4" pilot is so distinctive it cannot be confused with any other designs. Couplers are available in sleeve type only. L-Style couplers can be identified by one wide band and one narrow band.