Keystone Sales & Associates Expands into North and South Carolina with Aqua-Rex, Dahl Valve, and Noble

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Three new product lines in KSA’s southeastern territory make the goal of becoming

One of the Mid-Atlantic’s largest PHVAC manufacturers’ reps within reach


(Pottstown, PA – October 9, 2018) Just a few weeks ago, Keystone Sales & Associates (KSA) announced the addition of ComfortPro pex tubing products available in its North and South Carolina territories’ its lines. Now, KSA owner and CEO, Bob Della Sala, revealed that the company is offering Aqua-Rex, Dahl Valve, and Nobel to their southeastern customers too.


“Our growth has been remarkable this year, and we have no intention of slowing down,” said Della Sala. “Our goal is to act in the best interest of our customers, bringing the product diversity they need and superior value that they won’t find anywhere else.”

Aqua-Rex, Dahl Valve, and Nobel offer complementary product lines for plumbing contractors. Each has their own niche, and here is what customers should know about each:

Aqua-Rex offers an advanced electronic physical water conditioner that has been used for the treatment of hard water in the UK and the rest of the world since 1993. It is widely used in homes, schools, offices, factories and hotels with many hundreds of thousands installed and successfully working. Plus, they just announce their newly IAPMO certification.


Dahl Valve
Incorporated in 1952, Dahl Brothers is a family-owned manufacturer of top quality plumbing & heating valves and specialties for the hydronic industry.  Their products, which meet or exceed CSA, IAPMO, and NSF requirements, are engineered as practical real-world solutions for plumbers and contractors on the jobsite.

Dahl’s products are distributed through high quality wholesalers, original equipment manufacturers and retailers throughout Canada and the U.S.A.

Noble Company is an American-based company, founded in 1946, that manufactures premium-quality, innovative products for the tile, plumbing, heating and cooling, and fire sprinkler industries. Everything the company carries is designed and manufactured to exceed applicable industry standards and are engineered for reliability.

Noble product applications include waterproofing, crack prevention, and sound reduction under tile flooring. The engineered fluids division manufactures freeze protection fluids for various applications such as hydronic under-floor heating, solar heating systems, geothermal systems, and fire sprinkler systems.

“We are incredibly selective about who we represent,” said Della Sala. “Each of these companies has built their brands on meaningful and responsive customer service, and manufacturing the best plumbing products in the business. We are excited to nurture these relationships further and involve them more in collaborative KSA opportunities.”


A major part of KSA’s customer-focused value proposition is the organization’s commitment to on-going industry training and advancement. At Keystone University, located at the company’s Pottstown, PA headquarters, each training programs is designed by top-level industry pros to enhance knowledge of industry trends, best practices, and new products. All programs at Keystone U are free of charge to all PHVAC industry professionals.

To learn more about these latest manufacturers’ offerings available through KSA, call 1-800-220-1025 or visit


About Keystone Sales & Associates:

Established in 1973, Keystone Sales & Associates (KSA) is the premier manufacturers’ representative for Plumbing, Heating, Ventilation and Air Conditioning products in the Mid-Atlantic region. Headquartered in Pottstown, Pennsylvania, the company is experiencing rapid growth and expansion by offering a large selection of related products from a single source. As a value-added supplier, KSA provides distributors and contractors with customer support and hands-on technical training through its professional development arm, Keystone University.