Oatey’s updated Drain Seal promises to block unwanted odors, sewer gases, and insects from entering a home through a drain. The product is engineered with a drainage system that prevents water from evaporating in the P-trap and allows for continuous water flow, which inhibits ponding or pooling around a drain, according to Oatey. The non-chemical product requires no special tools for installation and is available in 2- or 3-inch sizes for approximately $30. oatey.com