Blaster 18oz R-134a Recharge Kit with Pressure Gauge. Blaster Proprietary refrigerant formula replaces lost refrigerant and oil. The formula improves the a/c's cooling capabilities and provides better heat exchange by forming a protective film to decrease friction, reduce engine drag, prevent oxidation and sludge formation and extend the compressor life. Stop Leaks - System safe chemical additive stops leaks in o-rings and other rubber components where most common leaks begin. Extends Compressor life and increases system performance. Re-Useable Recharge Hose - with built-in low-side pressure gauge. Not for use on hybrid/electric vehicles with non-belt driven (electric driven) compressor