Preventing drainage problems before it causes damage to your property is easier than you think. Ideal for spaces where a traditional catch basin won’t fit, the 18 in. Square Low-Profile Adapter used with an 18 in. catch basin grate drains heavy flows from lawns, landscaped areas, under downspouts, patios, and walkways. Polystyrene adapter connects to a variety of drain pipes sizes—from 3 in. to 8 in.—using designated outlet adapter (sold separately).