The 143-16-021-03 is a replacement regulator spring manufactured for use in Sensus brand regulator series 243-12 & 121. The spring has a range 3.5" to 6.5" of water column and is red in color. (Note: when used as a main spring in some multi spring configurations the 143-16-021-03 will have an outlet range of 1.5" to 3.5" water column. Designed to work on the 243-12 and 121-12 regulators with inlet connection size of 1.5", 2" and 2.5"
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