Easy to use for do-it-yourself applications, but heavy duty construction will stand up for shop use or mobile service professionals. A built-in check valve allows easy release of displaced air and the decompression valve releases negative pressure. See-through container for quick reference and a built in pour spout for no-mess disposal. Suitable for engine oil, gear lube, brake fluid, coolant, etc. Not for use with flammable or corrosive products.