Is a leak from a fixing behind the Condense Trap easy to fix? ?

My Glowworm Flexicom cx 30 has been leaking since it was installed. I've managed to locate the leakage to where a rubber pipe fixes onto a metal pie behind the Condense Trap and Siphonic Drain, however I don't know the name of this part to work out a realistic cost price for the repair. Can anyone help with this and also give me an idea of repair price. I'd very much appreciate any help
Many thanks
K