Diamond ITR is your leading Long Island plumbing company. Specializing in all phases of plumbing, heating, air conditioning and water filtration. We have been serving all of long island including Nassau and Suffolk counties for over 20 years! Diamond ITR has completed thousands of residential and commercial jobs, each one with extreme attention to detail and white glove customer service. Our highly trained service technicians have the knowledge to complete your job with efficiency. Whether it is an emergency plumbing repair, new HVAC system, heating problems, boilers and more, we are here for you! We specialize in Residential and commercial plumbing for Long Islanders.