This Bunsen burner features a heavy base to prevent tipping and adjustable gas and air inlets. A brass, threaded needle valve plus a rubber O-ring provides gas regulation while preventing gas leakage. The aluminum mixing tube with flame retainer comes equipped with adjustable vents for air regulation. Burner output 800-1200 BTU. Requires burner tubing with an i.d. of 5/16" (Flinn Catalog No. AP8285). Complies with federal specifications.