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U.S. Patent No. 6,530,722
Reinforced mesh is "sandwiched" between layers of polyurethane -
increases durability and resistance to tearing.
Unique, urethane construction allows the pad to deform and seal
off most drains — temporarily "seals" to any smooth surface.
A valuable addition to any emergency response plan, spill kit or
storm water management program.
alternative products, BOTH sides will quickly seal drains - there is
no specified "top" or "bottom".