The 04221-U1104-71 Toyota Diaphragm Overhaul Kit is a premium-quality replacement kit designed for rebuilding Aisan LPG regulator/converter assemblies used on Toyota forklifts with 4Y and GM 6-cylinder LPG engines. Manufactured to OEM specifications, this kit restores regulator performance, improves fuel delivery, and extends the service life of your forklift's fuel system. Contact UN Solution to verify compatibility using your forklift model and serial number before ordering.