For years the hydraulic industry has struggled with maintaining system cleanliness. Once a component such as a valve, pump or cylinder is removed from the system, the hydraulic oil is more susceptible to dirt ingression. The other issue occurs when an accessory or attachment is removed or added to a piece of machinery leaving the system open to atmosphere allowing an easy path for dirt to enter also risking environmental oil spills. The Leak-SealTM Flange Locks are a simple solution to closing and locking out contaminants from your hydraulic system - no need for stuffing rags into ends, and no tools required - simply a one handed twist. They are colour coded for quick reference and are designed to work with SAE Code 61, 62 & CAT style hydraulic flanges. Note: Not to be used under pressure or for pressure testing.