Filter Adapter, 2" female thread (fits PF-170).
Adapter allows use of the PuraSpa PF-170 on newer Arctic Spas® (replaces Silver Sentinel - threaded style), and other spas that use a filter with a 2" female thread.
You only need to purchase the adapter once, and is re-usable with disposable 1 micron filters or pleated style filters.
If you have an older Arctic Spa, that uses a 13-5/16" long filter that is open on both ends (not threaded), then you can use the PF-170 filter without an adapter.
*Hot Tub Essentials is not affiliated with or an authorized dealer for Arctic Spas®.