floor drain backflow preventer

Drain covers are offered in several square sizes (for example 5×5" and 8×8") and other cover-type dimensions around 5–6 inches; the pump is listed at 6.5 × 3.74 × 2.36 inches.

The smooth silicone surface rinses easily under a faucet. A built-in buckle allows you to hang the cover for convenient storage near the sink or drain.

Listings emphasize a tight seal on sinks and floor drains to block leaks and odors, plus odor-resistant silicone construction to limit smells.

The pump uses a self-priming design to reduce liquid backflow, while the silicone covers form a seal over sinks or floor drains to block leaks and odors.

The pump package includes the pump unit, two hose clamps, and a user manual; the hose clamps secure 8 mm inner-diameter hoses to the pump fittings.

The covers are described as durable, odor-resistant silicone that resists deformation and can be reused multiple times.

They rely on strong adsorption (suction/adhesion) combined with a flat design to hold them firmly in place and form an effective seal.