2043T 1 Qt. Pressurized Siphon Cup Assembly - Straight Nipple - Teflon
This is the exact same cup assembly installed by Fuji on their standard spray guns only with a TEFLON coating inside. See 2042 for full description.
The assembly includes the 2024 Pressure Tube, a fitted 2036 Gasket and 2038 Diaphragm. It is the diaphragm that helps prevent paint entering the pressure tube. It acts as a shield.