Fit 3" and 4" sewer and drain pipe, 3" and 4" corrugated pipe. Collects excess surface water from lawn and landscape areas. Sump area collects debris and prevents clogged pipes. Has 2 each 3 " and 4" locking outlets Fit 3" and 4 " sewer and drain pipe, 3" and 4" corrugated pipe Collects excess surface water from lawn a