When retracting or extending a hose on a reel, there is a tendency for the hose to twist or kink, which can cause damage and hinder the smooth operation of the reel. The inlet swivel allows the hose drum on the reel to rotate freely, while the inlet feed hose stays in place, preventing twisting and kinking during winding or unwinding. This ensures that the hose remains in good condition and extends its lifespan.