Fits on Models: DUAL, DUAL GPR, DUAL SH 1.75, DUAL SH-1.50, DUAL SH-1.75 GALLON, DUAL TF, DUAL-SH, GMB-PS, IC2, IC2B, IC3, RWS1, RWS1A, RWS1B, S, SA, SINGLE, SINGLE SH, SINGLE SH 1.5, SINGLE SH 1.75, SINGLE TF, SINGLE TF 1.5, SINGLE TF 1.75, SL, SLF, ST, ST-20, ST35, STA, STF, STF-20, STFA, SYSTEM III, TU 5, TU5Q, VLPF, WS2, WS2B