You're running conduit to a ceiling fan or fixture and a standard box won't work - the opening is wrong, the clamp doesn't fit, or the box isn't rated for the application. This 1/2-inch PVC round saddle box is built for the exact fitting of 1/2-inch PVC conduit, with the knockouts and clamping method that electricians in this region actually use for residential fan and fixture runs. 1/2-inch PVC construction with integral conduit hub and shoulder - seats flush against the work surface. Rated for use with PVC conduit in dry and damp locations. The round body provides plenty of room for wire splice connections inside the box. Standard issue for electricians running PVC in residential and light commercial work across northeast Nebraska and northwest Iowa - the fitting that shows up on the tru Stocked at Crofton Lumber and Akron Lumber.