Preventing valves from falling into the combustion chamber during spring or stem seal replacement, this valve holder uses air pressure to keep components seated. The 12" (30.5 cm) flexible hose includes a two-step fitting compatible with 14 mm and 18 mm spark plug threads. One end threads into the spark plug hole while the other connects directly to an air supply to maintain constant pressure.

Preventing valves from falling into the combustion chamber during spring or stem seal replacement, this valve holder uses air pressure to keep components seated. The 12" (30.5 cm) flexible hose includes a two-step fitting compatible with 14 mm and 18 mm spark plug threads. One end threads into the spark plug hole while the other connects directly to an air supply to maintain constant pressure.