From 1959 to 1972 6 cylinder fuel-injected engines as well as the 6.3 V8 only. If one day your pump starts leaking out the bottom plate or just won't spin this kit may help.
Push them over a hose and they act like a sealing end cap. Turn them around and push into a hole to act as a plug. Cut in half - use one piece for a splice between hoses.