STEMCO 359-5990 Red Vent Plug for Oil Caps – Fits 300-4009 & Other Aluminum Hub Caps

✅ STEMCO 359-5990 Red Vent Plug for Oil Hub Caps – Fits 300-4009 and Other STEMCO Caps

Part Number: 359-5990
Fits: STEMCO 300-4009 and other select STEMCO aluminum oil hub caps
Application: Dexter 22.5K–27.5K Air Brake Axles (and other heavy-duty wheel-end systems)

This is the genuine STEMCO red vented plug designed for use in a range of STEMCO aluminum oil hub caps. It allows proper venting and pressure regulation inside the hub while providing a tight seal to protect against contaminants.

🔧 Key Features:

• OEM vent plug for STEMCO 300-4009 Oil Cap

• Also fits other compatible STEMCO aluminum oil caps

• Maintains internal hub pressure balance and reduces seal stress

• Durable construction resists oil and heat exposure

• Easy to install and service during hub maintenance

🚚 Applications:

• Dexter heavy-duty trailer axles (22,500–27,500 lbs)

• STEMCO aluminum oil caps across various fleet vehicles

• Prevents pressure buildup and premature seal wear in oil-filled hubs

🔁 Related & Replacement Parts:

• STEMCO 300-4009 Oil Cap – 6-Bolt, 5.5" Bolt Circle

• STEMCO 330-3009 Gasket for 300-4009 Oil Cap