Cherne's Pillow-Style Muni-Ball® plugs are great for blocking sewer flow and can also be used for sewer air testing. Made from heavy-duty elastic urethane, these plugs are lightweight, flexible, chemical and petroleum-resistant, and will fit through small-diameter openings. Pillow-style plugs can be tethered with the attached tether bars, and will work in all types of pipe, including ductile iron sizes. A repair kit is available to fix small tears and punctures.
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