Trusted Performance - Our lock-nut style bronze stuffing boxes (MP and RP Series) are based on the traditional design professional mariners have trusted for over a century. Available in a variety of sizes and lengths, these cost effective stuffing boxes feature a robust housing and durable threads. Commonly used as rudder ports on low horsepower boats. 41-PART SELECTOR I SIZING GUIDE Part Number R.E. Thomas Marine Hardware | (207) 422-6532 | www.retmarine.com