Killark KBM20FA25 - Suitable for Explosionproof and Dust-Ignitionproof environments. Copper-free aluminum. Light Blue Anodized Finish. The KB flame arrestor provides a means to connect gas analysis equipment and electro pneumatic devices’ piping or tubing through the wall of a explosion proof or flame proof enclosure with volume up to 160 liters. They are cCSAus certified for Class I Groups BCD, Class I Zone 1 & 2 IIB+H2, Class II Groups EFG, Class III, Type 4 & 4X. Also, ATEX, IEC Ex, Ex d IIC, IP66. The KB are offered in aluminum, 304 series stainless steel and 316 stainless steel. Supplied standard with a high temp silicone O-Ring on flame arrestors with male metric threads. Male thread sizes 1/2” NPT & M20 and female thread sizes ¼” & M16. - The flame arrestor provides a means to connect gas analysis equipment and electro pneumatic devices' pipe or tubing system through the wall of an explosion-proof enclosure.