The Wilkins 950 is a double check valve assembly. Production of the Wilkins 950 began in 1990. The 2 1/2"-10" sizes were discontinued in 2004. The Wilkins 950 version has a non-replaceable check seat. The Wilkins 950A had replaceable bronze seats. The 2 1/2"-10" utilizes a fusion epoxy coated cast iron body. The check seats are replaceable and the spring is contained when the bolted cover is removed. The internal hardware parts are mostly bronze. The 2-1/2” – 10” were superseded by the 350 series.