I modified the inner ring from svideo's design to attach the Cen-Tec 1-1/4" vacuum hose while utilizing the same well-designed outer ring.
https://www.amazon.com/gp/product/B0899M2MZS
This is a remix from https://www.thingiverse.com/thing:4512926
DeWalt_AirLock_Inlet_outer_lock_ring.stl | 248.5KB | |
Dewalt_Airlock_to_1.25_Cen-Tec_inner.stl | 417.0KB |