Bring a decorative touch to the garden with the Fake Rock Artificial Stone Septic Risers and Manhole Lids - 111. This faux stone is especially designed to cover unsightly exposed pipes, giving any outdoor space a cohesive look.The Fake Rock Artificial Stone Septic Risers and Manhole Lids - 111 is a must have for any outdoor space. Hollow construction allows everything from septic risers to manhole lids to be concealed inside. Made of recycled polyethylene this faux stone is an eco friendly choice. This UV resistant landscaping rock won't fade in the sun or crack in the cold. Durable construction means it is resistant to impact and line trimmers.