Well yea, especially when I had a spare standard cap at home, pmsl, I could have saved myself a lot of grief but there we go, na u should be ok mate! sounds like u say the pipe has just perished over the years! Well, for the sake of it I would by a new one, if they are the same as the s2 pipe I can get u finis, and they are not that exspensive, bout £7 odd I think P.S it should push all the way on without moving the pump.