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.