Delivering outstanding results in Texas for more than 20 years The MRK promise is simple ¬– we will grow your business. There is no other plumbing products rep firm that knows Texas’ unique markets like MRK. Our established relationships, product knowledge and dedication to service provide more than just a local presence. MRK is a trusted partner. Established in 2000, MRK works with builders, architects/engineers, plumbing contractors and wholesalers ensuring our manufactures’ products are always top of mind. The company’s co-founders are well-known and highly respected professionals with extensive networks. Shawn McCall is a two-time WDA Representative of the Year and Doug Rihn is a multi-year nominee. MRK’s responsive team offers unmatched comprehensive regional representation.