Combination Chamber, For Use With Grainger Item Number 31NG70, 31NG71, 31NG73, 31NG75, 31NG76, 31NG77, 31NG78, 31NG79, 31NG80, 31NG85, 31NG86, 4YF89, 4YF90, 4YF91, 4YF92, 5U739, 5U740, 5U741, 5U742, 31NG60, 31NG61, 31NG62, 31NG63, 31NG64, 1U083, 1U092, 1U140, 1U141, 31NG96, 31NG97, 31NG98, 4YF87, 4YF88, 31NH02, For Use With Mfr. Model Number 1000, L1000, 8100, 3000, Fits Brand Simplex, Includes Combination Link, M-63/M-56