The Mahle Sealant Detector Kit includes everything techs need to make a fool-proof determination of the presence of leak sealant. It quickly lets users know if an A/C system sealant has been added to the A/C system. Once techs know that sealant is not present they can safely recover the refrigerant and start repairs. The kit includes reusable A/C system couplers and enough replacement cartridges to sample 10 vehicles. A 25-pack of replacement cartridges (No. 216045) is also available.