Starbrite STR-31400R Sea Safe Premium Non-Toxic Marine AntiFreeze, -50F (Gallon) *Sold in Quantities of 3Starbrite -50F (-46C) Non-Toxic Antifreeze provides excellent cold weather and corrosion protection for drinking water systems and all engines. Its premium additive package prevents corrosion of aluminum, copper, brass and solder, but will not harm rubber, seals or hose materials. The 3X-died bright pink color provides excellent blow-through visibility. Formulated with virgin, non-toxic USP-grade ingredients. It contains no alcohols. This product is ready-to-use; do not dilute it.Starbrite -50F (-46C) Non-Toxic Antifreeze will provide burst protection to -50F (-46C) and freeze protection within a range of +12F to +16F (-11C to -9C). When testing with a refractometer or hydrometer freeze point readings on the PG scale will range from +12F to +16F. Note: The burst point of PVC pipes used in most drinking water systems is about -10F (-23C). When winterizing water systems in regions where temperatures can fall below -10F (-23C), we recommend using Starbrite -100F (-73C) Non-Toxic Antifreeze.Features: Protects water systems & engines from freeze ups during storage.; Use in boats, RVs, vacation homes, pools.; Safe for copper, brass and all types of plastic.; 30% formula contains corrosion inhibitors.; Formulated to be non-toxic and biodegradable; Dyed in bright colors to allow for easy blow-through visibility; Provides superior copper and PVC burst protection; Contains anti-corrosive agents; AntiFreeze Dilution Chart: Undiluted2 Pts Solution / 1 Pt WaterItemCopper BurstPVC BurstFreeze ProtectionCopper BurstPVC BurstFreeze ProtectionWintertech-50F-10F+17Fn/an/an/a-50-50F-10F+12Fn/an/an/a-100-100F-80F-60F-72F-50F-6F-200-200F-150F-100F-120F-90F-80F 1 Pt Solution / 1 Pt Water1 Pt Solution / 2 Pts WaterItemCopper BurstPVC BurstFreeze ProtectionCopper BurstPVC BurstFreeze ProtectionWintertechn/an/an/an/an/an/a-50n/an/an/an/an/an/a-100-54F-20F+9Fn/an/an/a-200-86F-66F-28F-62F-30F+5F