The Muffin Monster Manhole from JWC Environmental makes it easier to install a grinder in sewage lines. This fiberglass reinforced polyester manhole has the Muffin Monster grinder that shreds troublesome solids and eliminates pump breakdowns, the company says. The height, pipe size and type of top (traffic or hatch) are customizable based on site requirements. The manhole also features a JWC immersible motor and a factory installed guide frame/access ladder.