Taco 953-5153RP, Seal (Type E), Mechanical Design (250#), Frame L, for use with Model FI 1206, FI 1206D, FI 1207, FI 1207D, FI 1506, FI 1506D, FI 1209C, FI 1509, FI 1509C, FI 1509D, FI 1511, FI 2511, FI 2013C, FI 5013, FI 5013D, FI 6013, FI 6013D, FI 2513