Tirrill Burner without Pilot Flame. For use with LP cylinder gas. Provides separate control of both flame temperature and flame length. Burner produces a clear flame of any desired height from 1/2" (12.7mm) to 12" (305mm). The burner consists of a threaded aluminum air control sleeve and precision machined fine-pitch brass needle valve with internal stuffing box and self-sealing packing. A rustproof 3-1/2" (89mm) octagon-shaped, plated die-cast base and aluminum mixing tube are also utilized. The mixing tube ID is 3/8" (9.5mm) and the inlet OD is 7/16" (11mm). Overall height is 6" (152mm). Meets UL flame test and ASTM D3713. Humboldt# H-6225. Capitol# B9182.