- available in 3, 3 1/2, 4, 4 1/2, 5, 5 1/2 and 6 inch lengths - thread that screws onto the blowpipe is a 9/16" X 30 tpi thread - big bored - through bore is 11/32" (0.343") and the outside diameter at the mouthpiece tip is 1/2" - mouthpiece section is stright so the longer ones can be cut shorter but still keep the 1/2" outside diameter
