The koo-di tap protector helps protect your little one from scalding on the hot tap as well as helping prevent against bumps at bath times. the tap protector's soft yet durable cover fits securely on most single or mixer taps. the heat spot gradually fades in colour when in contact with hot water to reveal the word hot at around 39oc. as well as being easy to fit and use the tap protector is made from antibacterial phthalate free pvc and is mildew resistant. adult supervision is required at all times.