Backflow Reference Manual - Wilkins

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375 / 375A / 375XL / 475


3/4" , 1", 1 1/4", 1 1/2", 2", 2 1/2", 3", 4", 6", 8", 10"


This is a reduced pressure assembly. Production of the 3/4"-2" began in 2004. The 3/4"-2" use a bronze carriage which holds the glass filled noryl check/relief body which nestles into the carriage. In 2010 the 375XL was introduced using lead free bronze in the wetted areas. The checks are an in-line modular design. Spring tension must be released to perform a repair of the checks. The relief valve uses an internal sensing line. Production of the 2 1/2"-10" began in 1998. The 2 1/2"-10" check body is fused epoxy coated ductile iron. In 2010 all leaded bronze trim items were changed to lead free bronze. The checks are accessed from a single cover on the top which is attached with a grooved coupler. The checks are modularized so the springs will be contained when the cover is removed. The 2 1/2"-6" size checks are held in the body by retainer clips while the 8"-12" checks are bolted into the body. The spring tension is contained when the checks are removed from the body. Spring tension does not have to be released to change the check discs. The relief valve utilizes an external sensing line. The relief valve body is made of bronze. The relief valve spring is not contained when the cover is removed. The model 375 is a horizontal piping orientation. The model 475 is able to be changed to provide an up and down or vertical piping orientation. The repair kits for both models will be the same. In 2004 the 375 became available in an "A" model (e.g. 375A) . The A model uses a grooved end valve body configuration as opposed to the flanged end valve body.


Common repair parts are a very small subset of the 10,000 plus items BAVCO stocks. Please feel free to contact us direct at 800-458-3492 for pricing on items not listed or backflow prevention devices.