S
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A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z
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SPDT – Single-Pole, Double-Throw
SPST – Single-Pole, Single—Throw
SCOTCH YOKE OPERATOR (Used on quarter turn valves)
SPHERE-LOK (a Grove trade name)