There are several manufacturers of shower seats in the USA. Here are some popular brands that offer a wide range of shower seats:

• Moen: Moen is a popular brand that offers various shower seats, including freestanding, wall-mounted, and transfer benches. Their products are known for their durability and stylish design. 

• Drive Medical: Drive Medical is a well-known manufacturer of healthcare products, including shower seats. They offer a range of shower seats with varying weight capacities and features, such as padded seats and adjustable height. 

• Delta: Delta is a reputable brand that offers various shower seats, including shower benches, corner seats, and transfer benches. Their products are known for their quality and functionality. 

• Kohler: Kohler is a trusted brand that offers various shower seats, including wall-mounted, freestanding, and transfer benches. Their products are known for their elegant design and high-quality materials. 

• Medline: Medline is a leading manufacturer of healthcare products and offers a range of shower seats with varying weight capacities and features, such as adjustable height and backrests. 

These are just a few examples of the popular manufacturers of shower seats in the USA. There are many other reputable brands available that offer a range of shower seats to meet individual needs and preferences.