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After the D System's patent in 1983 the D System has become the industry standard of self-contained water delivery systems for residential fire protection. The D System products are complete, easy to install, and will meet your specifications, as well as the NFPA codes for one and two family dwellings. We hope your visit to our web site answers all of your questions. Please do not hesitate to contact us through this web site, phone 410 692 7605, or text  410 984 7840.