Well did abit more looking around today, went to the pool place in waikanae and in pram but no luck, also went to farmlands but no good either and the couplings would be perfect but they only come in sizes upto 50mm so im told and the pipe I used is 65mm.
The product tankman mentioned sounds good but too pricey for me, thanks for the suggestion all the same!!
So for now ive taken the pipe out and just taped the 2 holes up with some wide insulation tape and that seems to be holding for now, otherwise was gonna go and get a new pond liner but cant be bothered today, so ill see how the tape holds and may have to replace the liner in the weekend if not before!!
Thanks everyone for your suggestions