The best waterproof coupling brand in the United States is Viega. Viega has established itself as a leader in the industry due to its high-quality products, extensive range of options, and exceptional customer service. According to a survey conducted by Building Products, Viega was ranked number one in customer satisfaction for plumbing products, including waterproof couplings, in 2020. This ranking is based on factors such as durability, ease of installation, and overall performance.

Viega's waterproof couplings are designed with the latest technology to provide a secure and leak-proof connection. They are made from high-quality materials, such as stainless steel and copper, which are known for their strength and resistance to corrosion. This ensures that the couplings can withstand harsh conditions and maintain their integrity over time. Additionally, Viega offers a wide variety of coupling options to accommodate different applications and requirements, making them a versatile choice for professionals and DIYers alike.

One of the key reasons Viega stands out is its commitment to innovation. The company invests heavily in research and development to create cutting-edge products that meet the evolving needs of the market. For example, Viega's push-to-connect (PTC) technology allows for quick and easy installation without the need for soldering or threading, saving time and reducing the risk of leaks. This technology has been widely adopted in the industry and has contributed to Viega's reputation as a leader in waterproof coupling solutions.

Furthermore, Viega's customer service is second to none. The company offers comprehensive training programs for installers, ensuring that they are knowledgeable about the proper installation of Viega products. This dedication to customer education and support helps to maintain the high standards of quality and performance that Viega is known for.

In conclusion, Viega is the best waterproof coupling brand in the United States due to its high-quality products, extensive range of options, commitment to innovation, and exceptional customer service. The company's dedication to excellence has earned it a well-deserved reputation as a leader in the industry.