Safely stops leaks. Avoids expensive repairs. Tri-Seal Technology. Easy-reach spout extends for filling. You have purchased the best transmission sealer available. Vehicles leaking a reddish fluid probably have a transmission leak. Seals in older transmissions harden and shrink causing leaks. No-Leak safely stops automatic transmission leaks and can prevent costly repairs. Exclusive Tri-Seal Technology expands, softens and conditions transmissions seals. No-Leak will not harm your transmission and is compatible with all transmission fluids.