General description Chaffoteux Caldera Security Valve is designed for use with various models including Celtic 2.23, GM 15.20, and NGM20JE. This valve ensures safe operation by maintaining pressure levels within the system. Technical specifications Pressure rating: 3 bars Model numbers: NGM20JE, Celtic 2.23, GM 15.20 Part numbers: 61020933, 61004632 Compatibility and accessories Compatible with Celtic 2.23 (61004632, 61020933) Compatible with GM 15.20 (61004632, 61020933) Compatible with NGM20JE (61004632, 61020933)