This .75- gallon side tank is compatible with(black stainless steel-XPIO23BCBT or stainless steel-XPIO23SCSS) and has a slim and rounded design that complements the main Opal ice maker and helps maintain a compact footprint on the countertop. Features: .75-Gallon Side Tank Convenient and Easy to use 3x more ice than using the reservoir alone Easy- to-Clean Side Tank