Even the grouting on the tiles is rubbish!
also as such the air admittance valve is incorrectly installed it is supposed to be above the level of the overflow of the sink in this application ie about a foot higher to comply with building regs and to work properly
also as such the air admittance valve is incorrectly installed it is supposed to be above the level of the overflow of the sink in this application ie about a foot higher to comply with building regs and to work properly