Compatible with any 2" tri-clamp fitting.
The 1.5" thread will fit inside and connect to a T500 condenser, or if you are looking to just adapt your distillation lid you can fit the adaptor using a 1.5" backnut (see below)

Lead free brass adaptor to simply screw into the base of the T500 condenser.
Add other asseccories like the Still Spirits sight glass or tri-clamp steam lid 

The adaptor has a screen to hold the condenser packing in place.

Compatible with T500 reflux and T500 Alembic condensers.

You may also need:
2" tri-clamp
2" gasket

If you need to use 2 of these adaptors to attach to a T500 lid you may need a 1.5" back nut which you can find here