Complete kit suitable to recharge R134a systems only. Fast and easy to use DIY aircon top up kit, incredible performance – makes your warm vehicle ice cold One can of topup is designed to be the right amount for an average vehicle that is low on (not empty of) coolant. Contains 168g net (equivalent to 453g R134a aircon coolant). Refer to vehicle data for specific system capacity. To use this product the engine must be running, AC compressor must be in working order and switched ON before attempting to add product. Always wear safety goggles and gloves when working on air conditioning systems.