If you are repairing or maintaining hydraulic equipment, you make and re-make connections daily. You know to use plugs and caps to plug open ports and cap disconnected hoses, in order to keep the the dirt out and oil in. This method works for most connections, but when it comes to flanges most mechanics' oil containment method is to shove a rag into the open port, and another in the end of the disconnected hose (or tube assembly).
Now, there's another option – using FlangeLock™. The FlangeLock™ allows for quick, simple sealing of open SAE Code 61, Code 62 & CAT-style hydraulic flange connections without tools. It is the ultimate spill and contamination control during disconnecting and re-connecting flange fittings.