TW-Risers by Infiltrator are made from glass-reinforced polypropylene, providing superior strength and durability
They come in green or black with a 24" diameter, making them ideal for use with any concrete or plastic tank.
The slip-resistant lids are fastened using stainless steel screws and are further secured by indexing structural ribs, which lock the riser into place
TW-Riser system lids are made from virgin polyethylene, providing strength and increased impact resistance
Slip-resistant lids come with an indexing mechanism locking them into place and can withstand a wheel load comparable to that of a full size pick-up truck
The improved urethane gasket creates a built-in watertight seal.