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The 1 1/2" Wilkins 950 Double Check Valve Assembly was introduced in 1990 and was replaced by the 950XL in the mid-1990's. The difference in the 950XL was the plastic replacable seats. Original 950 models do not have replacable seats.The 950 is a two cover, wye pattern design. The checks are a poppet style and are not self contained and there is spring pressure against the covers. No special tools are required to service.
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