Interface Guide
DOE, 222 and 226 Filter Cartridge End Caps Explained
DOE, 222 and 226 describe installation and sealing arrangements, not filtration performance. A cartridge can have the correct media and micron rating yet still fail to seal in the housing.
DOE is open at both ends and commonly seals with flat gaskets or housing compression. 222 and 226 use double O-rings at one end; 226 adds locking tabs that engage the housing seat. Dimensions and housing design must still be verified.
DOE vs 222 vs 226: compare the connection
These are common arrangements, not universal dimensional approvals. A code does not establish seal material, filtration efficiency or housing compatibility.
Swipe to compare all columns.
| Connection | Typical sealing arrangement | Confirm before replacement |
|---|---|---|
| DOE | Open at both ends; commonly uses housing compression and end seals. | Check both seating faces, core diameter, seal type and installed length. |
| 222 | Typically a single-open-end adapter with two O-rings; the other end is closed. | Check adapter diameter, groove positions, socket depth and the opposite end. |
| 226 | Commonly uses two O-rings plus bayonet tabs for location and locking. | Check the socket, tab geometry, engagement depth and hold-down arrangement. |
Can 222 and 226 cartridges be interchanged?
Do not assume so. Matching length and micron rating is insufficient: the socket, O-ring grooves, locking features and opposite-end support must all match the approved housing drawing. A fit check does not validate filtration performance.
Replacing a high-flow element? JC-PPPA, JC-PPPK and JC-PPPM use their own connection systems. Do not assign a DOE, 222 or 226 fit from appearance alone.
Check JC high-flow connections separatelyDOE: double open end
The cartridge is open at both ends. Housing compression and flat gaskets usually create the seal. Confirm gasket material, core diameter and knife-edge or flat-seat geometry.
222: double O-ring plug-in
A plug-in adapter with two O-rings seals inside a socket. The opposite end may be flat, finned or another closed configuration.
226: O-rings plus locking tabs
The seal resembles a 222 interface, but tabs or bayonet features mechanically locate and lock the cartridge. A 222 element should not be assumed to fit a 226 seat.
What must be measured
Record adapter diameter, O-ring groove positions, tab width and angle, opposite-end form, overall length and housing seat geometry.
Information to send an engineer
The checklist opens in the editable inquiry form; nothing is submitted automatically.
Suggested citation
JINLV Filtration. DOE, 222 and 226 Filter Cartridge End Caps Explained. https://jinlvrfilter.com/resources/doe-222-226-end-cap-guide
Verify product-specific data and documents: Product catalogs · Quality and acceptance requirements
Continue reading
End-cap names identify a family, not an approved fit
Reference basis
This guide describes DOE, 222 and 226 connection patterns. The linked JINLV measurement guide is a preparation aid, not an independent interchangeability test.
What is not established
Do not infer insertion diameter, seal-groove tolerance, locking-tab engagement or installed length from the end-cap name alone. Gasket/seal chemistry and the opposite-end support also affect suitability.
Before approval
Obtain the housing and cartridge drawings with revision numbers. Resolve conflicting dimensions before ordering; mechanical trial fit and filtration-performance validation are separate steps.
Published by JINLV Filtration · Content updated: . References support preliminary review, not independent certification or a signed engineering approval.