"1-DOUBLE ENDED CYLINDER P/N 304L-HDF4-1000-PD DIMENSIONS 3.50 IN OD, 10.9 LONG, 0.180 IN THICK, FEMALE NPT SIZE 1/4 IN. 1-VALVE P/N SS-16DPM4-F4-BC-W1-PD 1-VALVE WITH RUPTURE DISC (PRD) P/N SS-16DPM4-F4-1-BC-W1-PD CYLINDER AND VALVES MARKED WITH THE PI SYMBOL."