Air Pump Reduction (21-10)

This is a simple reduction i made for an air pump. I made it pretty thick as it will indulge a lot of wear and pressure. I think the sizes of air pump are pretty standardised so i'm posting it for others also. Personally, i made it in PETG, but PLA works as fine too. Used 3 walls for perfect endurance and 20% infill. Perfect for a good repair in the house. You can always size it as you may like.