What is this?The female conduit fitting is a pipe sleeve, an accessory that connects the pipes and the electrical boxes. It is widely used in cable connection devices and DIY projects.What will I get?The female adaptor, we provide here, is in the size of: Total Size: 39 x 22mm / 1.5 x 0.9 inch (L*W); Hole Diameter: 15mm / 0.6 inch; Fit Pipe Diameter: 20mm / 0.8 inchIn the package of: 5 x Conduit AdaptorAre there any advantages of the product?Made of PVC material, the adapter is waterproof, corrosion resistant, and flame retardant. It can reduce the gap between the conduit and the back box, and protect the insulating shell of the wire.How to use it?Steps of installation: 1. Apply glue to one end of the conduit, connect the conduit and the adapter; 2. Tighten the lock nut to the mounting hole of the bottom box.