I was trying to force the pump into the external fitting - always a tight fit/struggle - when I heard a disconcerting snap. I thought it was the metal prong but they are intact. The black washer - the seal? is now not there. The pump now actually fits rather better - ie more flush to the van , but water is flooding out on turning on taps. Shops shut for Christmas, Amazon not delivering any time soon. Any thoughts as to how I might bodge this so we can use the taps for a week or so?