Mixer, Pilot, Burner : Mechanical devices located in the arrestor housing and breeching which mix the fuel and air and control burning and flame position. (RP 12N)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}