These fittings for high pressure connections are designed for finger tightening but when access is limited or your hand is just not strong enough

Also convenient when removing the fitting. Use a wrench to "break" the seal and remove the fitting’s remaining turns by hand; eliminate hand and finger fatigue. Great for people with small hands and fingers.

A "flat area" is provided to wrench the last ¼ turn. This assures that your high pressure fitting is sealed and is less likely to leak.