Product Overview Consists of a plated brass tube with threaded disc valve for adjustment of the air/gas mixture. Has a conical mixing section and a 9mm serrated inlet tube. Suitable for propane gas. Reviews (1 review) Write a Review 1 Review Hide Reviews Show Reviews 5 Great value and service Posted by Charles Parton on Sep 11th 2015 I fully recommend Sci-Supply. The staff were extremely helpful. I was in need of science supplies in a quick time frame and not only did I receive the items in time but the quality is exceptional for the price I paid for the items.