HiFi Filter SI 90834, direct aftermarket replacement. Walker Filtration E831AC is a compressed air filter element, rated Oil vapour, oil carry over 0.005 mg/m3 (grade AC). The same element is listed under 3 other numbers from Atlas Copco, HiFi Filter, Noitech, all in the cross reference table below.
Grade AC is the activated carbon element: it adsorbs oil vapour and odours and must sit after an X1 and XA pair, because liquid oil saturates the carbon. The element sits in the compressed air line and takes out particles, water and oil aerosols down to its rated grade, which protects dryers, tools and processes downstream. Every element is checked against the part number before it ships, and every order is covered by our
30 day money back guarantee, worldwide delivery and
price beat guarantee.
Technical properties & cross references
Specifications
| Part Type |
Compressed Air Filter Element |
| Replaces |
Walker Filtration E831AC |
| Filtration Rating |
Oil vapour, oil carry over 0.005 mg/m3 (grade AC) |
| Media |
Activated carbon |
| Stat. HS-Code |
842139 |
| Country of Manufacture |
China |
Price beat guarantee
We check what other aftermarket sellers charge for this same part. Their prices on the date we checked:
| Seller |
Price |
Checked |
| The Air Market |
USD 183.97 |
22 Oct 2026 |
| FilterFinder Online |
USD 247.00 |
22 Oct 2026 |
| Nordic Filtration |
USD 252.88 |
22 Oct 2026 |
| Spare Part Mart |
USD 62.77 |
Today |
Our price of USD 62.77 is 66% to 75% less than these sellers.
Found this part cheaper somewhere else? Send us the listing and we will beat it by 5% under our Price Beat Guarantee. Every order is also covered by our 30 day money back guarantee.
Use cases & applications
Scheduled service
Change the element at least once a year, or sooner if the differential pressure gauge on the housing shows it is loaded.
Breakdown spares
Keep one on the shelf so a loaded compressed air filter element does not stop the machine while parts are ordered.
Workshop and fleet stock
Workshops looking after several machines can stock this one element under any of its 4 part numbers.
Frequently asked questions
Is this a genuine Walker Filtration E831AC?
No. It is an aftermarket compressed air filter element made to replace the Walker Filtration E831AC. It is not made by or affiliated with Walker Filtration, and the part number is used only to show what it replaces.
Will it fit my machine?
It replaces the element numbered Walker Filtration E831AC and the other numbers in the cross reference table. Check the number on the old element or in the machine's parts list.
When should I change the activated carbon element?
Carbon stops adsorbing once it is saturated, whatever the pressure gauge says. Change it at least every 6 to 12 months, or sooner if oil vapour or odour comes through.
How do I fit it?
Isolate the filter housing and let the pressure out. Unscrew the bowl, pull the old element off its seat, fit the new element with its O rings lightly lubricated, refit the bowl and pressurise slowly. Check for leaks.