The Performance Tool W84005 Air Hold Fitting is a versatile tool designed for holding air pressure in cylinders during valve service or engine testing. It is commonly used in automotive repair and maintenance to prevent valves from dropping into cylinders or to keep them in place during engine assembly. The air hold fitting features a durable construction and is compatible with 14mm and 18mm spark plug threads. It provides a secure seal to maintain air pressure within the cylinder, allowing for precise measurements and inspections. With the Performance Tool W84005 Air Hold Fitting, you’ll have a reliable tool for safely and effectively holding air pressure in cylinders. Features: Air hold fitting Designed for holding air pressure in cylinders Compatible with 14mm and 18mm spark plug threads Provides a secure seal for precise measurements and inspections Specifications: Brand: Performance Tool Model: W84005 Tool Type: Air Hold Fitting Compatibility: 14mm and 18mm spark plug threads