6.6 Duramax (2001-2019) Sandwich Plate & Thread Extension Kit
Pre-order now to lock in current pricing
This item is expected to ship in the first week of November 2026, or sooner.
Oil Filter Sandwich Plate with Thread Extension Kit – 6.6 Duramax (2001–2019)
Create a simple, reliable oil-pressure supply connection for an Insane Diesel bypass oil filter system with this application-specific oil filter sandwich adapter kit.
Designed for 2001–2019 6.6L Duramax engines, this complete assembly includes a precision-machined T6 billet aluminum oil filter sandwich plate and a correctly matched stainless-steel oil filter thread extender. The sandwich plate installs at the engine’s oil filter location to provide the pressure-side oil supply connection required by a bypass oil filter system.
Alternative to the Traditional Pressure-Port Connection
This Sandwich Plate with Thread Extension Kit provides an alternative method for accessing pressurized engine oil without using the traditional factory pressure-port connection. Installing the pressure supply directly at the oil filter location can simplify bypass oil filter installation and provides a clean, application-specific connection point.
What Sets the Insane Diesel Design Apart
- Dual-seal design: aluminum-to-aluminum sealing plus an O-ring
- Precision-machined T6 billet aluminum sandwich plate
- Black-anodized finish
- Custom Insane Diesel engraving
- Correctly matched stainless-steel oil filter thread extender
Product Features
- Designed for 2001–2019 6.6L Duramax engines
- Provides a pressure-side oil supply connection for a bypass oil filter system
- Installs at the factory oil filter location
- Alternative to accessing the engine’s factory pressure port
- Matched sandwich plate and thread extender designed to work together
- Designed for use with Insane Diesel bypass oil filtration systems
Important Installation and Maintenance Requirements
Follow these requirements along with the complete instructions supplied with the product:
- During initial installation: Clean the thread extender, apply Blue Loctite 242 or an equivalent threadlocker, and then torque the thread extender to 35 ft-lb.
- At every oil-filter change: Check that the thread extender is torqued to 35 ft-lb.
- If the billet oil filter sandwich plate is ever removed: Replace the O-ring before reinstalling the plate. Do not reuse the old O-ring.
Included
- One billet aluminum oil filter sandwich plate
- One matched stainless-steel oil filter thread extender
Buying a Complete Bypass Oil Filter Kit?
Select the Sandwich Plate with Thread Extension Kit as the pressure-port option on the compatible 6.6L Duramax bypass oil filter kit page and save $75 compared with purchasing this product separately.
Important Fitment Information
This oil filter sandwich plate and thread extender are designed for compatible 2001–2019 6.6L Duramax applications. They are not intended for 3.0L Duramax engines or other non-compatible applications.
This product provides the oil-supply connection for a bypass oil filter system. It is not a complete bypass oil filter kit.
Shipping, Returns & Refund Policy
U.S. Shipping
We may occasionally use a shipping carrier different from the one selected at checkout to improve delivery speed, protect fragile items, or reduce overall shipping and handling costs, including packaging and processing.
Expedited Shipping Policy:
Selecting expedited shipping (Overnight, 2-Day, etc.) does not include order processing time. Please allow 1–2 business days for processing, excluding weekends.
For faster delivery options, contact our Shipping Department at (801) 901-0667 Ext. 3.
International Shipping
International shipping charges are calculated at checkout and do not include customs duties, taxes, brokerage fees, or tariffs imposed by your country upon import. These fees are not controlled by Insane Diesel and vary by location and local regulations.
Customers are solely responsible for all import-related charges. We strongly recommend contacting your local customs office or postal service in advance to understand applicable fees before placing an order.
Canada: Estimated duties and taxes may be reviewed at https://www.cbsa-asfc.gc.ca/travel-voyage/dte-acl/est-cal-eng.html
Return & Refund Policy
General Return Policy
Due to the nature of aftermarket automotive components, returns are not accepted for buyer’s remorse, incorrect ordering, or compatibility issues. Customers are responsible for verifying vehicle compatibility prior to purchase. We encourage reviewing installation guides and confirming pressure and return port locations before ordering.
Products that have been installed, used, modified, contaminated with oil or fluids, or show signs of installation are not eligible for return or refund, except where required by law.
Any return request must be approved in advance. Returns sent without authorization may be refused.
Damaged, Defective or Missing Items
All products are inspected prior to shipment. If your order arrives damaged or defective, you must notify us within 7 business days of delivery and provide clear photos of the damage and packaging.
Only unused items in original condition are eligible for replacement or refund. Upon inspection and confirmation, you may choose between a replacement or a full refund.
Missing components must be reported within 15 days of the delivery date. Each order is packed individually to help ensure all components are included and to maintain quality control. A packing slip/manifest is included with every shipment; please review it upon delivery to verify that all components were received.
Approved Returns & Refunds
In rare cases where a return is approved (outside of damage on arrival), requests must be made within 30 days of delivery.
Approved refunds will be issued minus:
- Return shipping costs
- Original outbound shipping costs (even if free shipping was offered)
- Payment processing fees charged by Shopify (approximately 2.4–2.5% + $0.30)
Refunds are issued to the original payment method after returned items are received and inspected.
Contact Us
If you have questions about shipping, returns, or refunds, please contact us at support@insanediesel.com.
Our housings feature a high-quality anodized finish. Because anodized colors can photograph differently under various lighting conditions, the color shown online may appear slightly different in person. Minor tone, shading, or finish variation can also occur naturally from the anodizing process and is a normal characteristic of this type of premium finish.
Phone:
Hours: M-F, 9AM - 5PM (MST) –
(801) 901-0667
Email: Support@InsaneDiesel.com
