Designed for residential, commercial or industrial use with water, oil or gas. This approved Webstone valve is specifically designed for power purging individual loops in a hydronic heating system and ensures the critical distance between tees is within tolerance for hydronic separation. Actuated by a blow-out proof stem and features an adjustable packing gland. Solder joint temperature ratings are per ASME B16.18 Annex A for 95-5 solder. Other solder materials have lower pressure/temperature limits. Do not silver braze or overheat valves when soldering.