KOEHLER K40000 LPG Corrosion Test Cylinder. This LPG Copper Strip Corrosion Test Cylinder is a stainless steel cylinder with 1/4" needle valves for purging and admitting LPG samples. Dip tube with hook suspends copper strip in sample. Knurled, threaded cap with O-ring gasket hand tightens to a positive seal. Withstands hydrostatic test pressure of 1000 psig (6895kPa). Conforms to the specifications of: ASTM D1838; GPA 2140; ISO 6251.