Beefy 2 Inch Billet Aluminum Weld-On Filler Neck Cap For Overflow Coolant Tank, Black Finish, Heavy Duty, Reliable Seal, OEM Threaded Neck, Includes Pressure Cap, Easy Install

Heavy-Duty 2-Inch Billet Aluminum Weld-On Filler Neck Cap
✔️ Single cap with OEM threaded neck and pressure cap included

This billet aluminum overflow coolant tank cap fits OEM tanks with a threaded fill neck. It is machined from billet aluminum with a polished surface and a durable anodized finish, and it includes a pressure cap for immediate use. The scalloped design adds a rugged look to any engine bay while improving aesthetic appeal and sealing reliability. Cap sizes: 1" (25.4 mm), 2" (50.8 mm), 2.5" (63.5 mm).

✅ Fits OEM coolant tanks with threaded fill neck
✅ Billet aluminum construction with polished surface and anodized finish
✅ Includes pressure cap for immediate use
✅ Cap sizes: 1" (25.4 mm), 2" (50.8 mm), 2.5" (63.5 mm)
✅ Easy install on standard neck fittings

💡 What is a filler neck cap used for in engine cooling systems?

A handy upgrade helps seal the overflow system and add a custom look.

- Seals OEM threaded necks for secure fit
- Maintains proper coolant pressure with included cap
- Durable billet aluminum with anodized finish
- Easy replacement on standard overflow tanks