Mansfield Genuine 3987-1112 Flush Valve MPP35 and comes with the nut

and comes with the nut

This Replaced Part 630-0108

Mansfield Genuine white color SB700 slow close elongated toilet seat

It is the most common cause of the toilet leaking and being hard to flush

The Mansfield Tank Model 3916 Rebuild Kit contains

Mansfield Genuine 3987-1112 Flush Valve MPP35 and comes with the nutThe Mansfield 3987 1112 flush valve. The 3987 1112 flush valve comes complete with the flush valve gasket, nut, flapper, flapper seal, and the float. This is a 3 inch flush valve designed for the Mansfield tank model 3987. The flapper on this flush valve is not replaceable, but the red rubber seal on the bottom of the flapper can be replaced. It is listed under item number 630 0030.