The Mansfield genuine 31 chrome trip lever is an all plastic lever. It is designed to fit Mansfield tank models 172, 173, 174, 3120, 3121, 3122, 3125, 3173, 3174, and 3165. This lever will come complete with the reverse threaded locking nut to secure the lever to the tank. Reverse threads means, you will turn the nut to the left to tighten, and right to loosen it.
