Eight manufacturers are recalling about 1 million drain covers for pools and in-ground spas that were incorrectly rated to handle the water flow through the covers, the U.S. Consumer Product Safety Commission announced Thursday.

The covers could pose an entrapment hazard to swimmers and bathers, the agency said. Consumers should stop using the products immediately. Anyone with one of the recalled drain covers should immediately contact the manufacturer to get a replacement or retrofit, depending on the make and model.

Replacement or retrofit of the hard plastic drain covers isn't required in pools with multiple drain systems or gravity drainage systems, or for covers installed before Dec. 19, 2008. In every case except one, the drain covers were sold between December 2008 and April 2011. Those made by Pentair Water Pool and Spa were sold between June 2009 and April 2011.