The SkyWatcher Esprit 120 and 150 require the Starizona ApexED 0.65x reducer to be placed farther back from the optical tube. And when used with Starizona Apex Threaded Adapters, the drawtube on the focuser is not long enough.

This spacer adds 2" between the focuser and threaded adapter. It threads onto the focuser itself, keeping the attachment of the ApexED reducer secure and square.