Water main Insullated Ducting entering house

[vdub]

I have to lay down a water main for a new connection. As far as water regs are concerned i will need to put the a 25mm mdpe pipe in a 100mm insulated duct as it enters up through the foundations and into the house.

Does anyone know where i can get an approx 1m long insulated duct for this. I have come across a product called shalloduct but it only seems to come in big reals.

thanks in advance