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Mr. John is proud to announce the opening of a new service location in Stoneboro, PA. Our new Mercer County location will increase our service capabilities and response times to Butler, Crawford, Erie, Lawrence, Mercer, and Venango Counties. The Northwest PA office will provide all of the same equipment and services that Mr. John and Tri-Boro Trailer currently offer. This includes portable toilets and toilet trailers, septic tank pumping and service, as well as mobile office trailers and ground level storage containers.