This aftermarket LPG regulator valve repair kit is engineered to service dual-stage vaporizer/converter units used in forklifts powered by K15, K21, K25, and 4Y engines. It replaces OEM reference numbers 04221-U2040-71, 04221U2040, and variants, offering a complete set of internal components to rebuild a leaking or underperforming regulator. Included are fuel-resistant diaphragms, seals, gaskets, and springs—all precision-fit for reliable, long-term use. This kit is ideal for preventive maintenance or emergency repairs, helping reduce idle problems, vapor delivery failures, and LPG system inefficiencies. It's made for demanding forklift environments where uptime matters. This is an aftermarket replacement part. It is not manufactured by or affiliated with any original equipment brand. OEM part numbers are used for identification purposes only.