Winter Proof™ Water System Antifreeze provides superior protection for pipes and waterlines during winter's worst conditions. With the BurstGuard™ -50 °C Guarantee, it is ideal for winterizing cottages, RV's, swimming pools, boats and septic systems. Total water system protection. Safer protection. Safer for winterizing plastic and metal pipes with corrosion inhibitors. Lubricates waterlines, pipes and seals. Non-toxic.