The 143-16-021-05 is a replacement spring for use on Sensus service regulator model Series 121 & 243. The Green spring in this series has a range of 6" to 14" of water column. This is the standard size for the 121 and 243 models. If you require a different spring range, see the accessories tab on the product detail page for all available replacement springs. These are ordered separate and must be installed.
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