The inspection ports are mounted onto 1ft lengths of Waterguard ready for easy installation (so don't forget that's 1ft less that yo need to buy!).
The ports have a telescopic adjustment for use during installation to ensure that each port lid can be precisely levelled in relation to the floor. the lids are hinged so they do not easily get misplaced and lost.
They allow for post installation inspection, testing and flushing out if necessary. The can also be use for a dehumidifier drain.