fountain pump threaded adapter

What problem does this solve:My old fountain pump has an unusual threaded tap that doesn't fit any of my pond or fountain kits and I lost the original adapter. It came with barbed adapters but I wanted to use the common 20mm smooth tubes that come in common Pond Nozzle Kits, such as, Smartpond©'s kit found at Home Depot. Hard to find thread size The fountain pump I have is out of date and has an obscure internal 15/16 - 16 UN thread that took a lot of trial and error to make fit the pump's internal thread. The smooth tubes that come with pond kits are approximately 20mm or .79" and unions have a tapered interference fit that is less than ½ degree draft. Materials:I've printed multiple version with PETG-CF and PLA and fond that PLA works but long term I may replace it with the PETG for more outdoor submerged durability. Open to custom adapterIf you have a similar old pump and need a customized interface, I'll consider updating the models and re-slice for other ma