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Vented Poly Tank Screw On Lid 8" - Norwesco 63480
This 8 inch replacement screw on lid fits the BIG A 125 & 225 gallon PolySkid series of tanks sold AFTER 2012 and has a built-in vent cap for reducing positive or negative pressure within the tank.
The tank manufacturer changed the mold around 2011 - 2012 which resulted in a different style of lid used with the tanks. The best way to tell if you need this lid is to remember if your old lid had a blue vent cap or a black vent cap. If it had the blue vent cap, you will need this replacement lid. You can find the older style lid here