The Kuryakyn 9927 breather bolt provides a replacement piece for your motorcycle crankcase breather hose. Using the breather bolt you can install new or replacement breather components, allowing you to maintain your motorcycle condition. Durable designed in silver. Includes (2) 1/2"-13 x 1" breather bolt for Twin Cam; suggested for installation (not included): original breather hose instruction manual. The Kuryakyn 9927 breather bolt is compatible with Harley-Davidson models: '93-'99 Evolution Big Twin and '91-'19 XL.