★★★★★ 5
Worked Perfectly
Fits the S85 oil filter housing like a glove.
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Reviewed in the United States on January 6, 2026
VAILLANT 077398 CASINGThe VAILLANT 077398 CASING is a durable and reliable casing designed to fit your Vaillant boiler. With its high quality construction, this casing provides optimal protection for your boiler, ensuring long lasting performance and peace of mind. Expertly crafted and scientifically designed, the VAILLANT 077398 CASING is a must have for any Vaillant boiler owner.
Quick Dispatch:
Your VAILLANT 077398 CASING orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
Order Tracking:
You'll receive a tracking link by email once your VAILLANT 077398 CASING ships.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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Product Reviews
★★★★★ 5
Works as promised
Size: 2-Pack
Great product! Highly recommend. My check engine light turned off quickly, probably less than 20 minutes after I added the bottle to my tank and started driving. I waited a week to write the review just to make sure the check engine light didn’t turn on again. Success!
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Reviewed in the United States on April 1, 2026
★★★★★ 1
Don't waste your time
Size: 2-Pack
I did it 2 times back to back didn't do anything. Failed
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Reviewed in the United States on May 29, 2026
★★★★★ 4
Don't buy if your cat is plugged
Size: 2-Pack
The product works just not for long I followed the directions even added 2 it worked good until I filled up the vehicle with fuel
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Reviewed in the United States on May 31, 2026
★★★★★ 5
Great Product
Size: 2-Pack
Great product, worked wonders!! I would definitely recommend to others to buy this product!!
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Reviewed in the United States on April 5, 2026
