Product Description - EOSC - Emergency Oxygen Supply Connection. TPS Corp. EOSC box is for use with a bulk oxygen supply system to connect the temporary or auxiliary supply source in an emergency or maintenance situation. The box includes a 1" full port ball valve, 100 PSI pressure gauge and a 75 PSI pressure relief valve housed in a painted steel surface mount, lockable weather tight enclosure. The box is labeled "Emergency Low Pressure Gaseous Oxygen Inlet" and is built, cleaned and tested per NFPA 99 and CGA G4.1 requirements.