BOSTITCH TVA6 Trigger Valve Kit
Fits: N50, N57, N58, N60, N64, N70, N80C, N89C, N66, N100, N400, 650S4-2, 650S5-2, 750S4-2, 750S5-2, 850S4-2, 863S4-2, RN45, RN46, T40S5CLP, T50S4-2, F21PL, F38WW, F33PT, N75C, N86C.