Baffle Balls can be used with water, diesel and many other liquids. Reduce fluid movement for improved load stability during transit. Suitable for use with all tanks: steel, poly, fiberglass, aluminum, etc. Food Grade quality material – suitable for use with potable water. Simple to install – just clip together and place inside tank. Quantity recommended: 1 per 10 gallons for the 14" baffle ball and 1 per 2 gallons on the 7.5" baffle ball.