APEC Water SystemsAPEC Water Systems Replacement ORing for ROES-50 3.5" OD Reverse Osmosis Water Filter Housings, O-Ring (3 pcs O-Ring-Set-B)

Q: What is different between type A and B?

This answer must be old since systems purchased after 6/30/2019 also need Type A. The product description states this. I also called the company to confirm this.

Q: will these o rings fit aquapure house filter?

Hello, these are industry standard 3.5" , designed for APEC pre filter housings. We recommend that you check with the manufacturer of your system for their recommendation on O-Rings. If you need any help or assistance, feel free to give us a call we are happy to help! Best Regards, APEC Support Team 800-880-4808.