Primo's just right bath water level makes bathing a child easier and safer by maintaining a safe water level in the tub at all times. It is designed to maintain a maximum water depth level of either 2 or 10cm (as determined by the parent) by raising up the mouth of the bath drain by either 2 or 10cm . By maintaining this level of water the risk of drowning or injury is significantly reduced for the child. It can also be used to recirculate the bath water, keeping it clean and at a comfortable temperature. The just right bath water level has been designed exclusively with the safety and comfort of the child in mind and is made of soft TPE to prevent the child from being harmed by the bath drain. The just right bath water level can be used securely in any standard bath tub with a drain between 3.8cm - 5.1cm in diameter. It replaces the normal bath drain plug. It is made of soft, flexible TPE plastic that is BPA free, phthalate free, PVC free and lead free. For ages 6 months and older.