King Shocks KT1120-103 HD Nitrogen Inflation Schrader Valve Adapter Extension Stem 5/16"-24 Thread

King Shock inflation adapters are used to pressurize shocks, steering dampers and bump stops that do not have a traditional Schrader valve sticking out, but instead have a countersunk valve in the shock body or top cap. The inflation adapter threads into the shock (5/16-24 fine thread) and can then be charged using any standard nitrogen fill kit.

KT1120-103 has a 0.430" bottoms shoulder
KT1120-104 has a 0.375" bottoms shoulder

The shoulder is the portion of the extension just above the 5/16" bottom threads.