Conoco HYDROCLEAR EP Gear Oil 68 is or was manufactured by ConocoPhillips.

The product offered by PSC is either Conoco HYDROCLEAR EP Gear Oil 68 or a replacement product of similar quality and performance. 

See below for the equivalent products and select the 'View Manufacturer Info & Data Sheets' tab for safety data sheets, as well as product data sheets to compare specifications, approvals, properties, and performance characteristics.