40-100 / DC-40 / DC-40LF


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


This is a double check assembly. Production was begun approximately in 1989. The 1/2"-2" were discontinued in 2013. The 2 1/2"-10" sizes were discontinued in 2003. The 3/4"-2" sizes utilize a bronze body with a plastic poppet style check. In 2010 the DC 40LF was introduced which utilized lead free bronze. The check covers are screwed into the body. There are two body styles available either the wye pattern or top entry design. The wye pattern style was discontinued in 2002. From 1989-1994 the 3/4"-2" sizes of the assembly were produced with replaceable check seats as an option. In 1994 replaceable seats became standard. The replaceable seat version has an "A" in the second to last digit in the model number: e.g. 40-108-A2. A seat removal tool is needed to replace the seats. The check springs are not contained on these sizes when the covers are removed. The 2 1/2"-10" sizes utilize a ductile iron body that is fused epoxy coated. Most internal hardware parts are made of bronze. The 2 1/2"-4"sizes use a single body while the 6"-10" sizes have a split 2 piece body design. Check seats are replaceable on these sizes. A seat removal tool is needed to replace the check seats. Check springs on the 2 1/2"-10" sizes are contained when the covers are removed. Note each size has a different model number, but they are all in the 40-100 series.


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.