The Manta Bottom Cleaner from NozzTeq includes interior surfaces and interchangeable rear jetting plates made of stainless steel and ceramic parts designed to stand up to hard water and grit. The 50-plus-pound nozzle slides on wide runners that are replaceable, and stays on the bottom of large-diameter pipes, where it will do the most good. Its bottom surface will never wear out. Its jetting plate is interchangeable and replaceable, and comes in eight-, 10- and 12-jet configurations. 866/620-5915; www.nozzteq.com.