15. Thermal Regulator Kit - 77707-0010
16. Thermal Regulator (Includes Spring Clip) - 38000-0007S
18. Thermal Regulator Cap O-Ring - 35505-1313
20. Drain Plug - U178-920PZ
21. Zinc Plug 428-60 PS - U78-60ZPS
22. Pressure Relief Valve - 473715Z
23. 2 in. Union Adapter Package (Includes 2) - PKG188Z
O-Ring Kit - 77707-0120
Bypass Access Plug (ASME) - 472648Z
Heat Exchanger Kit (400 ASME) - 474096
Heat Exchanger Kit (400 ASME) - 474956
Heat Exchanger Kit (400 HD ASME) - 474953
Heat Exchanger Kit (400 ASME HD) - 474350
Heat Exchanger Kit (250 ASME) - 474097
Heat Exchanger Kit (250 ASME HD) - 474954
Heat Exchanger Kit (250 ASME) - 474955
Heat Exchanger Kit (250 ASME HD) - 474349
ASME Bypass Valve Kit (Old header design) - 460923
ASME Bypass Valve Tool Kit (Old header design) - 461007
Thermal Regulator Kit (includes Spring clip, ASME, Old header design) - 460924
1. Combination Gas Control Valve Kit - 42001-0051S
2. 3/4 in. Union - 38404-4097S
5. Air Blower Kit – Natural Gas Units (Models 175NA) - 77707-0250
5. Air Blower Kit - Natural Gas Units (Models 200NA) - 77707-0251
