This is brake booster, the OEM number is 224-00402, it is single one, the diameter of it is 10.5, it is in big size among the single diaphram, it is for Mitsubishi PS120 and FE119, it is used in many markets, such as Thailand, Malaysia, Dominica, Indonesia and so on, it also has another 2 OEM number, 226-00402 and 44610-37817, it is much more bigger normal single one, so the packing is 4 pcs in one carton.Brake Booster For Mitsubishi manufacturers website:http://www.aydbrakebooster.com/brake-booster/brake-booster-for-mitsubishi/.
