The MB 20 TTW is an Eyebath / Face Wash Fountain "Through The Wall Operation" is suitable for outdoor use (frost protected). Without a bowl, but with dust covers on the diffusers optional supplemented with black rubber Eye cups with hinged dust covers (including sign). These diffusers give a gentle aerated soft spray pattern which feels pleasant for the eyes. The operation will be done by means of a stainless steel operation bar. The solid mounting bracket is also made of stainless steel. The dust covers need to be placed back on the diffusers after usage. A Flow regulator is present on the unit in order to achieve a good spraying pattern. The Eyebath drains empty after usage. The valve is located on the inside of the wall (where there is no danger of frost), and the Eyebath and operation are located on the outer side of the wall. This principle makes the Eyebath frost protected. Please specify the wall thickness when ordering. Minimum water pressure is 2 bar.