Water Filter Tap Brushed Steel Mini Robin TapUSAGE: Fits Reverse Osmosis and Undersink drinking water filter systems using 1 4" water pipe. Reverse osmosis and all other under sink systems where 1 4" pipe is used. DESCRIPTION: Replace your existing filter tap with this elegant brushed steel filter tap. There is a lever handle for easy on and off. It takes 1 4" tubing which is connected up into the base of this tap. All fittings included to mount to worktop and connect to 1 4" pipe.