The Tusk Brake Master Cylinder replacement sight glass is made to replace the rotted or broken sight glass in many master cylinders. The 18mm (outer diameter) sight glass is common on many motorcycles, ATVs, and snowmobiles.

• 18mm sight glass replaces sun-rotted and broken master cylinder sight glasses.
• Common sizing that fits many motorcycles, ATVs, and snowmobiles (always measure your stock sight glass).
• Sealing O-ring included.