Across International Insulation Jacket with Window for Across International R Series 5.3 Gallon/20L Glass ReactorsHigh quality thermo insulation jacket with open close viewing window and top bottom adjustable drawstrings, specially designed and made for Ai R series glass reactors. This jacket will greatly increase the efficiency of your recirculating chiller, it will extend the life of the chiller compressor, allow your coolant temperature to go further down, and cut your utility bill dramatically. Chilling your glass reactor without a jacket is like leaving your