Product Description
**Milwaukee parts change not only by model# but also by serial number. To look up your tools parts break down on Milwaukee's website please click here:
Milwaukee Rubber Gasket
Model Number: 43-44-1100
The Milwaukee 43-44-1100 Rubber Gasket is a genuine OEM replacement part designed for use across multiple Milwaukee 2446 M12 Cordless Grease Gun platforms, including the 2446-20 (serial codes C39A and C39B) M12 12V Grease Gun bare tool, the 2446-21XC kit configuration, and the 2446-059 (D26A) Brazil-market variant. The rubber gasket seals the pressurized grease path inside the grease gun, preventing leakage between the barrel, pump head, and adjacent components during the high-pressure dispensing cycle that the 2446 platform delivers (up to 8,000 PSI working pressure). Milwaukee specifies a quantity of two of these gaskets per grease gun, so if you are replacing one due to wear, deformation, hardening, or leakage, it is good practice to inspect both positions and replace both at the same time to prevent a repeat repair within months.
A worn, hardened, cracked, torn, or missing rubber gasket on a cordless grease gun is the most common cause of grease leakage at the barrel and pump interfaces. Beyond the mess and waste, leaking grease reduces the working pressure the tool can deliver to greasing fittings, which compromises the entire purpose of using a grease gun for routine lubrication of equipment, vehicle, and machinery grease fittings. Replacing the gasket with this OEM service part restores the original pressure seal and full dispensing performance. The 43-44-1100 is specific to the 2446 M12 Cordless Grease Gun platform and is NOT interchangeable with the Milwaukee 43-44-0087 Rubber Gasket, which serves the larger 2646 M18 Cordless Grease Gun platform despite the similar appearance. Because Milwaukee Tool specifies replacement parts by both catalog number and serial number, always verify your tool's serial number against the official Milwaukee 2446-20 service parts diagram before ordering, since Milwaukee occasionally implements running production changes that affect part compatibility within the same catalog number. Verify by serial number using Milwaukee's online parts lookup before ordering to confirm correct fitment.
Features
- Genuine Milwaukee OEM replacement, direct factory part for the 43-44-1100 reference
- Confirmed fitment on the Milwaukee 2446-20 (SER C39A, C39B) M12 12V Cordless Grease Gun
- Also fits the 2446-21XC M12 Grease Gun Kit and 2446-059 (D26A) Brazil variant
- Seals the pressurized grease path between the barrel, pump head, and adjacent components
- Critical for maintaining the 2446 platform's full 8,000 PSI working pressure
- Milwaukee specifies a quantity of two of these gaskets per grease gun
- Manufactured to Milwaukee factory tolerances and rubber compound specifications
- Direct-fit replacement, no modification required for installation
- Restores original pressure seal after wear, hardening, cracking, or deformation
- Prevents grease leakage at barrel and pump interfaces
Specifications
- Manufacturer: Milwaukee Tool
- Part Number: 43-44-1100
- Official Description: Rubber Gasket
- Component Type: M12 Grease Gun Pressure Seal Gasket
- Confirmed Compatible Models: 2446-20 (C39A, C39B) M12 12V Cordless Grease Gun, 2446-21XC M12 Grease Gun Kit, 2446-059 (D26A) Brazil variant
- Quantity Required Per Tool: 2 gaskets per grease gun
- Material: Rubber compound
- Working Pressure: Rated for the 2446 platform's 8,000 PSI
- Quantity: Sold individually, 1 gasket per order
- Part Type: OEM Service Replacement Part
Includes
- (1) Milwaukee 43-44-1100 Rubber Gasket
- Note: Milwaukee specifies two of these gaskets per 2446 grease gun. Order quantity 2 if replacing both positions
- Note: This gasket is specific to the M12 2446 grease gun platform and is NOT compatible with the Milwaukee 43-44-0087 Rubber Gasket, which serves the larger M18 2646 grease gun platform despite the similar appearance
