The Rainsoft Hydrefiner P-6 Water Filter System uses an OR-38 o-ring gasket. This OR-38 gasket can be found here:
http://www.waterfilters.net/Pentek-C..._p_11-192.html
Replacing the o-ring gasket often is a very important step in maintaining your Rainsoft system. It is recommended that you always have an extra gasket on hand when you change your filter so that if there is any indication that the old o-ring is damaged you can replace it. You should replace the gasket every few filter changes regardless of the gaskets condition. By replacing your o-ring often you can prevent water from leaking unexpectedly from your water filter system.
We also carry the KX SC 20-185-125-083 Replacement Water Filter for the Rainsoft HYdrefiner P-6. The Replacement filter for theRainsoft P-6 can be found here:
http://www.waterfilters.net/KX-Matri...r_p_0-535.html