Hi, i've just put in a new bathroom suite. Because the oridginal loo was further forward then the new one i've tried to move it back as far as possible. i've used a flexible connector from B&Q, which although looks like a good connection, seems to leave a damp patch around the floor boards. I can only assume it is comming from the outlet on the loo. How should i seal this connection, silicon? Plumbers mate, or is this a possible inferior pipe? i've enclosed a pic.