Nelson's Pond & Waterfall Spillway Filter Box &#9989; ADDS THE SERENE SOUND OF FLOWING WATER: Nelson Water Gardens' Pond and Waterfall Spillway Filter Box is the fast way to add a waterfall or stream to an existing water feature! Install it in a pond or a pondless water feature. Then enjoy the peaceful sound of water falling from its 15 1/4 inch wide spillway lip. &#9989; PERFECT SIZE: The square filter box has inside dimensions of about 16 inches by 16 inches. It is 5 inches deep. The spillway lip extends 4 inches outward from the front of the filter box. &#9989; DESIGNED TO LOOK NATURAL: This spillway device is made to be camouflaged easily by rocks, which are not included. The result is a natural looking waterfall or stream. &#9989; EASY TO INSTALL: Made to be simple to set up, this spillway filter box includes a 1 inch barbed elbow for easy hose attachment. It has a 1 inch bulkhead with female pipe threading (FPT). It accepts hose with a 1 inch inside diameter (ID). (Hose is not included.) &#9989; LIFETIME MANUFACTURER WARRANTY AND MADE IN THE USA: This durable spillway filter box is backed by a lifetime warranty from its manufacturer. Built to last, it is a product of the United States of America.