How to make a Priming Manifold on top of my pool pump lid
I would use a brass bulkhead fitting with Orings. like this photo shows. Add your threaded shutoff valve and hose adapter and you will be good to go. Be careful when cutting the hole if using a standard drill bit they grab and want to break the plastic. A hole saw would be a better way to reduce the chance of breaking. For a 1/2" pipe a 7/8" hole saw for 3/4"pipe 1-1/8" hole saw are the standard sizes.