Use to apply air pressure to keep valve closed while replacing valve spring. Set includes 14 and 18mm adapters threaded for 1/4_ NPT. To use, remove spark plug and screw air hold into port. Fasten air hose to fitting and apply pressure. Use with 912, 2078, 3087 or 3271 Valve Spring Compressors.

Warning: This product may expose you to chemicals including lead which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov