This product connects your water collection container, such as a water butt or rain barrel, to a garden hose. It features a 1/2" BSP thread, requiring a 21mm hole for installation. To install, remove the nut and washer, insert the fitting through the prepared hole, then reattach the washer and nut, tightening from the inside. The universal garden hose connector can then be attached to any quality hose connector brands. This item helps you utilize rainwater that would otherwise run off into the drains, making the most of what nature provides.