New type of water butt cover with filter for water cleaning has small elevation at outer edge so water remains for birds to drink; water flowing over elevated edge section passes through filtering device into water butt as clean water
摘要
<p>The water butt cover (2) has a small elevation at the outer edge so that water remains for the birds to drink. Water flowing over the elevated edge section passes through a filtering device into the water butt as clean water.</p>
