So, I originally purchased a 6 inch threaded acrylic globe from Lowe's and a 3" PVC female adapter, the one that has threads on one end. Though the threads on the globe didn't match, it DID screw into the PVC adapter enough to stay held in until unscrewed.
Well, I found a better price on 6 inch acrylic globes from Superior Lighting, so I ordered some. Turns out the neck is slightly smaller than the ones I got from Lowe's and they don't "grab" the threads on the adapter like the first one did. So, instead of fooling with the threaded PVC adapter, since it costs more anyway, I created an adapter to hold the globe in a "normal" 3" PVC coupling (https://www.lowes.com/pd/Charlotte-Pipe-3-in-x-3-in-dia-PVC-Schedule-40-Hub-Coupling-Fitting/3132705).
I printed it in TPU (which is a flexible material), not sure that a hard plastic would work. Even though it's a "rubbery" material, I will probably still put a silicone bead around it to keep the water out, though I'm not sure it would matter.
Well, I found a better price on 6 inch acrylic globes from Superior Lighting, so I ordered some. Turns out the neck is slightly smaller than the ones I got from Lowe's and they don't "grab" the threads on the adapter like the first one did. So, instead of fooling with the threaded PVC adapter, since it costs more anyway, I created an adapter to hold the globe in a "normal" 3" PVC coupling (https://www.lowes.com/pd/Charlotte-Pipe-3-in-x-3-in-dia-PVC-Schedule-40-Hub-Coupling-Fitting/3132705).
I printed it in TPU (which is a flexible material), not sure that a hard plastic would work. Even though it's a "rubbery" material, I will probably still put a silicone bead around it to keep the water out, though I'm not sure it would matter.