The UEi BF100 is a barbed brass fitting with a 1/8 in. NPT male end and 1/4 in. barb for connecting a manometer to a pressure source. This fitting includes 18. in of tubing and is compatible with the following UEi products: C163, C165+, EM152, EM201B, EM720, C125, C127, C155, C157, EM151, EM201

Hi William! The BF100 is 1/8” NPT x 1/4” barb.