As a Ham Radio Operator, I was building a BALUN in a PVC tube, and needed a PVC end cap to accept the PL259 connector. This is designed to have the connector on the inside of the end cap and secured with #6 bolts that are about 1/2" long. This fits nicely on 1 1/4" Schedule 40 PVC pipe, and you can use regular PVC glue to attach it to the PVC pipe.