AUGUST JLC 1998 Products JLC's Products by Pete Young Room-by-Room Hydronic Zoning Zoning individual rooms for hot water or low-pressure steam heating is inexpensive and easy using automatic room temperature control valves. The solid brass, straight, angle, and horizontal-angle valve bodies accommodate radiators and baseboard units, and are available for both NPT and sweat connections in sizes ranging from 1/2 inch to 11/4 inches. The standard selfcontained valves can be complemented with remote sensing and control options. The manufacturer claims that its thermostatic controls will maintain a constant temperature to within 1°F. The valves have built-in freeze protection, which activates whenever room temperatures fall below 40°F, and a tamper- free temperature limiting or locking feature, which is set with a specially-shaped tool