Peak, Gallon, RV & Marine, Premium 100% Propylene Glycol Formula, Antifreeze, Provides Burst Protection Down To -50 Degrees Fahrenheit, - 46 Degrees Centigrade, Use Full Strength, No Mixing Required, Odorless & Tasteless, Safe To Brass, Metal, Copper & Plastic, Except Acetate, Pipes, Safe When Used As Directed, Ideal For Winterizing All Types Of Potable Water Plumbing Systems Including Those In Boats, Recreational Vehicles, Trailers, Vacation Homes, As Well As Swimming Pool Filtration & Heating Systems.