The Series 17C Balanced Pressure Thermostatic Steam Traps are for institutional, commercial and residential heating system applications such as schools, hospitals, apartment buildings homes or others where low or moderate water hammer may occur. Sub-cooling for extremely efficient system operation and elimination of flash steam losses on low pressure systems. Sizes available: 1/2" NPT Angle, Vertical. Replaceable Dura-stat® module. 3-Year Warranty. Meets Mil specification WW-T-696-E Type V, Style A, Class 1 and 2. Stainless steel components. Resistant to moderate water hammer and chemical attack. Maximum operating pressure 25 psi. Are available in 1/2", 3/4" & 1". Angle, swivel, vertical, straightaway.