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Ships within 48 hours · Estimated delivery Jul 31 - Aug 5
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Description
Wehrli Custom Fab WCF100155 Billet Heater Core Firewall FittingThe Wehrli Custom Fab WCF100155 Billet Heater Core Firewall Fitting from GAP replaces the plastic fitting on your 2001 2023 GM 6. 6L Duramax. The factory plastic GM Coolant Heater Core Firewall Fitting is a common failure point on Duramax trucks and other GM vehicles. This billet aluminum direct fit replacement is more resistant to heat and vibration. Prevent leaks with this easy to install upgrade. Features: Billet Aluminum Double O Ring Seal Clear
The Wehrli Custom Fab WCF100155 Billet Heater Core Firewall Fitting from GAP replaces the plastic fitting on your 2001-2023 GM 6.6L Duramax. The factory plastic GM Coolant Heater Core Firewall Fitting is a common failure point on Duramax trucks and other GM vehicles. This billet aluminum direct-fit replacement is more resistant to heat and vibration. Prevent leaks with this easy to install upgrade.
Features:
- Billet Aluminum
- Double O-Ring Seal
- Clear Anodized Finish To Resist Corrosion
- Replaces Failure Prone Plastic Factory Fitting
- Direct-Fit Replacement With 5/8" Barb Connection
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
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
4.3 ★★★★★
Based on 29 reviews
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Product Reviews
★★★★★ 5
Very much real gold
Color: Yellow Gold - 2 mm, Ring Size: 7, Color: Yellow Gold - 2 mm, Ring Size: 7
At first I thought that it was too tight. I started wearing it for a couple of weeks and it felt great after.
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Reviewed in the United States on May 22, 2026
★★★★★ 5
Buy it
Color: White Gold - 2 mm, Ring Size: 7, Color: White Gold - 2 mm, Ring Size: 7
Beautiful thin band that fits perfectly with my other ring! True to size. Great price for the quality!
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Reviewed in the United States on April 18, 2026
★★★★★ 5
Excellent quality
Color: Yellow Gold - 2 mm, Ring Size: 8
Beautiful ring. It went perfectly with the diamond ring I got her. 10/10 recommend this ring.
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Reviewed in the United States on December 26, 2025
★★★★★ 5
Beautifully shiny gold. I’m in love!
Color: Yellow Gold - 3.5 mm, Ring Size: 7, Color: Yellow Gold - 3.5 mm, Ring Size: 7
Yellow gold, 14k 35mm in size 7. Beautiful barrel design. Lightweight but solid. Polished & shiny. I am so happy with this ring! It’s just what I wanted. If you’re not sure what millimeter to get, for the 35mm. It’s worth it.
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Reviewed in the United States on October 17, 2025
★★★★★ 5
Satisfied
Color: Yellow Gold - 3.5 mm, Ring Size: 9
Beautiful
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Reviewed in the United States on February 12, 2026