The FS-400P Series is an inexpensive alternative for plastic piping systems. Units are available in clear PVC housings. The clear version, with a bright red shuttle, provides highly visible affirmation of flow status. Low-cost, all PVC versions are for use in systems where liquid pressures are below 120 psig and temperatures do not exceed 120°F. An easily removed, one-piece bonnet and shuttle assembly for quick clean-out is featured.