Providing moisture protection, the Measurement Specialties KPSI 811 permanent vent filter for KPSI transducers has a stainless steel housing. A Gore-Tex filter plug provides atmospheric reference without letting moisture into the casing. The filter measures 2.75 x 0.75 in. in diameter. 

 Measurement Specialties, Inc.; 800-745-8008; www.meas-spec.com