Guys pull your panties out of your crack there are literally hundreds of "proprietary" coupler designs out there and frankly I dislike pioneers because they piss out oil every time you uncouple. Flatfaced couplers work better but are a PITA to couple when the lines are under pressure.
If the K ones work better great, if not they come off and FF couplers go on just like I did with my pioneers.
If the K ones work better great, if not they come off and FF couplers go on just like I did with my pioneers.