Icon 12060 Holding Tank, HT175B-ED, 53 3/4x22 1/8x9-in, 29-Gal

The Icon HT175B-ED Holding Tank is an industry-leading choice for a reason. Namely, because it's built tougher and stronger than flimsy original tanks. Thanks to its impressive capacity, this bad boy can handle both black and gray water with ease. For added convenience, built-in sensors allow you to monitor the contents and status of the tank without opening everything up. In sum, it makes a fine addition to any RV.