NEW IMPROVED DESIGN!
> They are telescopic so that the lid may be set exactly at the right height in relation to the finished floor
> The lid is hinged so it cannot be mislaid and is less likely to be damaged
> The lid has an air-tight seal
> The hole is the full width of the channel making it easier to see inside.
Select from the drop down menu to get ports ready mounted on a 1ft length of Waterguard with the hole drilled and the port glued into place. This makes installation easier and faster and you reduce the amount of Waterguard that you need to buy, by 1ft with each mounted inspection port that you buy.