did your plumber use two different kinds of pipes? exp. copper and iron pipe, does only the shower have low pressure? or the bath to(if there is a bath)??? If the shower only has low pressure take the shower head off and c if there was stuff cloging it or restrikting the flow, turn it on w/o the head,… if you have good pressure put it back on, turn water on, if you still have low pressure then get a new head, not worth scru’in with trying to clean them. reply if its not the head. many other posibilitys but check easy ones first!
NOS Plumbing and Heating
Tristan Novak, Pres.