I have been asked to install a pressure reduceng valve on the cold feed to a house. I suggested removing some of the back on a kitchen cupboard to get it above the stop tap before it splits to applainces. However they don't want me to do this they want me to put the valve under the floor on the mains pipe before it reaches the internal stop tap they had already cut a trap in the floor. Puting a valve under the floor seems like bad practice to me. Any thoughts?
