Patol DFA 25-3 Detonation Flame Arrester for Explosion Zones category IIC 0.101557P Patol DFA 25-3 Detonation Flame Arrester for Explosion Zones category IIC 0.101557PDetonation flame arrester for explosion zones. Equipment category IIB eg. Hydrogen.2 pieces are needed per sampling tube. GBP 3815.99 1