Tankpro Pro 3.2 & 4.4 Reverse osmosis replacement faucet. 
Aquasky Rot-4 Reverse osmosis replacement faucet.PA-E Reverse osmosis (RO 132) Replacement faucet.
Classic Air Gap Design. The RO drain water goes up to the faucet in the red tube, then down to the sink's drain pipe in the black. The permeate tube connects to the threaded metal stem. The hole in the faucet body serves as an over-flow drain if the black tube is obstructed. 
attractive aquasky rot 4 faucet is the standard faucet for all reverse osmosis undersink filters and reverse osmosis units.
Sturdy top performer that uses the proven, traditional up/down handle style.
The faucet dispenses water with a downward push of the handle and locks open when the handle is pulled up.
The spout swivels 360 degrees.
Easy to install with 1/4" size and complete accessory for instructions.
Standard faucet air gap style.