Plumbing Installation & Repair New Construction, Remodels, Repairs Residential | Multi-Family | Commercial We have the staff to handle large multi unit developments, residential installations, re-models, and everything in between. New Construction Our new construction plumbing crews at HDP can cover all of your plumbing needs, from layout to build. We’ll make sure that your building's plumbing comes in on time and within budget. Plumbing Service HD Partners has merged with Ben's Plumbing to help provide solutions for all your plumbing needs. Call 206-789-5353 or get more info at www.bensplumbingseattle.com Backflow Assembly Testing HD Partners can take care of the required annual backflow testing and file the backflow report directly to the City for the many homes that require the installation of a backflow device.