AIR BOTTLE JACK (SPECIAL) Key Specifications/Special Features: MODEL: ZAB0412, ZAB0420 (1) Welded base and cylinders to assure strength and eliminated leaks. (2) Chromed pump piston and ram for added rust resistance. (3) Extension screw gives added height when necessary. (4) Meets ANSI/ASME PALD standards & CE/GS.