42H Accutube - Single Mount. These accutubes have a probe constructed of a 316LSS, with a 16LSS integral 3-valve head. Both have a single-mount support and are installed through a compression fitting and thredolet (included). The 40H and 42H are designed to mount a 21/ 8 center-to-center DP transmitter using O-rings. FNPT connections are also included in the design. The 42H model incorporates an integral RTD for temperature measurements. Series 40H & 42H Accutubes are available for sizes 6 through 42.