Part Number: RLD1. Use one 5ml bottle of dye per 250ml of refrigerant. Leak Detection UV Dye For AC Air Conditioning System. Ultra Violet leak detection dye for air conditioning systems. To use simply fill the dye dispenser with the UV dye, then attach this to the low pressure valve for the air con system, attach the refrigerant nozzle to the other end of the dye dispenser and fill the air con system.