I'm trying to find a adapter fitting to fit 1.5" bulkhead. I'm trying to put in a Durso pipe in the bulkhead in the overflow. The bulkhead does not accommodate 1.5" PVC pipe directly. I need an adapter that will fit in the bulkhead and then accept 1.5" PVC. All of the adapters I find are threaded where they are supposed to fit into the bulkhead. Does anyone have any idea where I can find these adapters?