Harris® 2393 size 2F alternate fuel gases curved heating tip tube with 1/2" - 25(M) thread connection fits 43-3, 18-5,V-315-C and 63-2 handles. Tip with 1/2 - 25(M) mixer tip thread has a tube of length 28" - 70 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.