Norwesco 20 Inch Underground Tank Lid

The Norwesco 20 Inch Underground Tank Lid (SKU N-63672) is the low-profile access cover for 20-inch riser openings on underground and septic-style systems. It measures 20 inches across and 4 inches tall, weighs about 4 pounds, and is molded from black polypropylene for UV and weather exposure at grade level. This is a replacement or spare access lid, not a tank, so there is no gallon capacity here; you are buying the operator-access closure that seals a 20-inch riser or manway collar.

Does it fit and seal

The lid is dimensioned for a nominal 20-inch opening (20.0 in diameter footprint), stands 4 inches tall, and weighs roughly 4 pounds. Per the technical drawing on this page it is an LP (low-profile) lid, and the gasket seats against the flat sealing face of the lid as shown on the drawing. Confirm your riser or manway is the matching 20-inch Norwesco pattern before ordering, since lid families are not cross-interchangeable between diameters.

Includes: integral gasket (LP lid + gasket, per the drawing).

The mistake to avoid

Order the lid to your opening's true measured diameter, not the tank's model number. A 20-inch lid will not seal a 16- or 22-inch riser, and forcing a mismatched cover compromises the gasket seat. Measure the collar's inside pattern and match this Norwesco 20-inch lid to it, then keep the included gasket seated and clean on the flat sealing face for a proper close. If you are still deciding on access-port sizing for a new installation, our manhole and lid engineering guide walks through 16-inch vs 22-inch vs hatch operator-access tradeoffs.

Freight

Norwesco lids stock at plants across the country. This item ships LTL, quoted live to your ZIP from the nearest stocking point - Sheldon, IA and Washougal, WA are among the named Norwesco locations, and inventory also draws from AR, AZ, CA, FL, GA, MN, NE, OK, PA, SC, TX, UT, and WV. At roughly 4 pounds this lid is a light add-on to a tank order, so if you are pairing it with a Norwesco underground tank, ask to bundle it when you request your quote.

Get your freight quote with the Freight Cost Estimator, or call 866-418-1777 and we will match the right lid to your riser and quote freight to your ZIP. Sizing a full system? Start with the Tank Sizing Calculator and Tank Sizing Guide.