Degas Tank Sight Glass Rebuild Kit for Sinister Diesel Aluminum Coolant Tanks
Keep your Sinister Diesel aluminum degas (coolant) tank performing like new with the Degas Tank Sight Glass Rebuild Kit. Age, heat, and chemical exposure can cloud the window or harden the seal. This kit replaces the wear items so you can restore a crystal-clear view of your coolant level and re-seal the assembly against leaks.
The kit includes a high-clarity glass lens, a high-temperature O-ring, and retaining hardware. It’s a quick, service-friendly refresh using basic hand tools—no need to remove the tank when coolant is drained below the sight glass.
Key Features & Benefits
- - Restores Sight Clarity for fast, accurate coolant checks
- - Stops Weeps/Leaks with a fresh high-temp O-ring seal
- - Direct-Fit for Sinister Diesel aluminum degas tanks
- - Chemical & Heat Resistant materials withstand harsh under-hood conditions
- - Quick Install — serviceable in place with basic tools
- - Backed by a 2-Year Warranty
Fitment
Application: Sinister Diesel aluminum coolant / degas tanks with serviceable sight glass
Not Compatible: OEM plastic tanks or non-Sinister aftermarket tanks
Kit Includes
- (1) High-Clarity Sight Glass Lens
- (1) High-Temperature O-Ring Seal
- (1) Set of Retaining Hardware
- Installation instructions
Details
Materials: Tempered glass lens; high-temp elastomer O-ring
Finish: Clear, polished lens
Compatibility: Sinister Diesel aluminum degas tanks only
Warranty: 2-Year
Install Time: ~10–20 minutes
Serviceable: Yes — rebuildable maintenance component
Installation
Allow the engine to cool fully. Drain coolant to below the sight glass level. Remove the retaining hardware and old
glass/O-ring. Clean the sealing surface thoroughly. Install the new O-ring and lens, then torque fasteners evenly in
a criss-cross pattern. Refill, bleed the system per the service manual, and check for leaks.
FAQs
Will this fit my OEM plastic tank?
No. This kit is designed specifically for Sinister Diesel aluminum degas tanks and is not compatible with OEM plastic tanks.
Do I need to remove the tank?
Not typically. If the coolant is drained below the sight glass, the rebuild can be performed with the tank in place.
When should I rebuild the sight glass?
If the window is cloudy or scratched, the seal shows seepage, or you notice residue around the lens, a rebuild will restore clarity and sealing.
Note: Verify your tank is a Sinister Diesel aluminum model with a serviceable sight glass before ordering.
