Machined from billet brass with a chrome finish, this product gives a clean and refined look to your gas tank. It fits directly into any gas tank with a 3/8” NPT thread. If your gas tank has M22x1 threads, you can use our petcock adapter nuts Part No. 11-025 and 11-026 (OEM 1955–’74). Comes with a petcock filter and accommodates 5/16” inner diameter fuel hose. (Note: This petcock does not have a reserve function—only ON/OFF operation is available.)