On January 1, 2020, two premier member-owned buying groups in the Plumbing, PVF, HVAC, and Waterworks industry merged to become The Commonwealth Group (TCG). Embassy Group Ltd. (established in 1991) and WIT & Co., Ltd. (established in 1974), both best-in-class groups comprised of independent wholesalers, saw an opportunity to join forces to become one of the largest buying groups (by volume) in the country.

AD is the largest contractor and industrial products wholesale buying group in North America. AD provides independent distributors and manufacturers of construction and industrial products with support and resources that accelerate growth. Our 700 plus independent member owners span nine industries and three countries with annual sales exceeding $40 billion. AD served industries include electrical, industrial, safety, bearings and power transmission, plumbing, PVF, HVAC, decorative brands and building materials.

ATS provides a free technical plumbing specification service to Mechanical Consulting Engineers, Architects, and Interior Designers in the Canadian and US marketplaces.

The specification service is available to ATS authorized users by hard copy and through the website. Users have access to build specifications unique to their particular applications with the support and assistance of the ATS team.

McGuire is proud to be an annual Sustaining Sponsor for 2025. AIM/R is dedicated to enhancing the quality and value of professional manufacturers' representatives in the plumbing, heating, and cooling industry. The organization is an advocate and a voice of manufacturers' representatives. The association delivers premier educational programs and opportunities to advance member knowledge, standing, and professionalism; strengthens and diversifies AIM/R’s communication to members; develops future leadership for the association; and grows membership.

AIM/R also partners with fellow associations to provide additional support.

MCAA is an association of approximately 2,300 mechanical, plumbing, and service contractors. In addition to the national association, McGuire is a long-standing member of the MCAA and the local Connecticut chapter.

ASA was officially formed in December 1969 through the merger of two groups: The Central Supply Association (CSA) and the American Institute of Supply Associations (AI). ASA is a not-for-profit national organization serving wholesale distributors and their suppliers in the plumbing, heating, cooling, and industrial and mechanical pipe, valves, and fittings industries. McGuire has been a member of the ASA for over a decade.