Sealing around the mains water pipe

[diffets]

The mains water pipe enters through the floor under the sink in our kitchen and there is quite a hole/gap around it through which we get a draught which is most uncomfortable seeing as we don't have a dining room and have to eat in the kitchen.

What is the best way to seal around the water main? Sand cement? Expanding foam? Silicone?

Any suggestions please.

Thanks.

[stoneyboy]

diffets,
Expanding foam is best if the gap is more than a few mm.
end