squeeze the 2 tails on the clip together,with this will cause the clip to expand jiggle the clip up to the thinner part of the pipe now twist to remove the old pipe off the pump.
Put the clip over the new pipe allow to slide down towards the larger end,now push the hose on to the pump fitting now using your pliers squeeze the tails and pass the clip up the pipe till just short of the end.
check for leaks
wirecutterman, January 2009