Locking bar is easily removed?
Lid of pit is easily removed?
Pit is a minimum of 500mm above the local ground level?
Drainage holes in pit are drilled sufficiently below top of air valve, and at least 100mm above ground level?
Air valve & butterfly/ball valve are operating correctly?
No leaks present?
Riser bolted flanges are dense wrapped if below ground?
Clean aggregate in base of pit for drainage?
There is no subsidence around pit?
Excess water can drain away from pit?
Marker & bollard are securely installed?
There is no rubbish in or around pit?
There are no other issues?