The A-518 is a 1500 gram capacity vacuum pycnometer with a 4-in. deep chamber. This vacuum pycnometer is used for mixes with aggregate sizes up to 0.5 inch

Both large capacity vacuum pycnometers include an aluminum volumetric canister, volumetric lid, flat Plexiglass vacuum lid with O-ring, volumeter, release valve, fittings, a metal aspirator with 3/8 inch IPT fittings and 6 ft of hose.