Harris® 2393 size 4F alternate fuel gases straight heating tip tube with 1/2" - 25(M) thread connection fits 43-3, 18-5, 63-2 and V-315-C handles. Tip with 1/2 - 25(M) mixer tip thread has a tube of length 10 1/2" - 180 degrees. Tip tube is used for large alternate fuel heating applications using Models 2290-H and 2290-HPM and Models RBA and RBP flame cleaning heads.