The easiest way to clean out your kegs , couplers and beer line is with this 10 litre WASH OUT KEG. 

Simply fill your washout keg with your preferred keg cleaning product and attach your coupler, and open your tap. We recommend letting the mixture sit in the lines for a minimum of 5 minutes, then flush with warm water

Specifications:
x1 - A-Type Spear - Silicone Hose Dip Tube
x1 - D-Type Spear - Silicone Hose Dip Tube
x1 - Cornelius Keg Lid With PRV

These  10L Washout kegs are fully passivated stainless steel and are backed with  a 5 year warranty.