When needed, the Mac Tools L42400 set is worth the cost
The Mac Tools L42400 air line disconnect tool set reduces sore fingertips when uncoupling air lines. The short end of the tools eliminate the need to pinch coupling rings with your fingertips, and the long ends reach into tight places to release stubborn air line couplers. Nine times out of 10 you can pop air lines loose with your fingertips, but every 10th time, when the coupler refuses to release, these tools are worth the $50 they cost.
— Dan Anderson