Starbrite 31100 Winter Tech -50 Water Systems Antifreeze, Gal.

Propylene glycol/alcohol blend. Formulated to protect against freeze-up of freshwater and sanitation systems to -50AF. Ready to use; do not dilute. The bright color allows maximum blow-through visibility. -50AF is copper burst point; -10AF is PVC burst point. NOTE: Not recommended for engine storage.