Polylok 18" Heavy Duty Cover/Lid for Corrugated Pipe (PN: 3007-HDC)

Fit's 18" corrugated or ribbed pipe. (Inside diameter: 17.30" / Outside diameter: 20.57") Skid resistance surface Highest level of UV Protection included Includes a foam gasket for airtight and watertight applications Includes square drive screws to discourage unauthorized entr