Part #: 34F-27-ADP
Strong and Adapter for faucets, for use with any INSTANT-OFF model.
ALL INSTANT-OFF have MALE (external) and FEMALE (internal) threads.
The INSTANT-OFF is shipped with a MALE (external) 15/16″ adapter installed at the top of the INSTANT-OFF. If you unscrew this male threaded adapter you will find FEMALE Threads 55/64.