2 pieces of O-ring fits all Spring Oasis Standard Whole House Water Filter Systems shown in the following pictures. Check your housing to make sure it is the same size as ours before purchase.  4" OD diameter and 3/16" cross section (CS) diameter.

• One stage 10" Clear Standard Whole House Water Filter System (222192334688)
• Two stage 10" Clear Standard Whole House Water Filter System (322022128585)