Taco Pro-Fit - IMP-A-100

LOW: (MATCHES ORIGINAL PERFORMANCE CURVES) BELL & GOSSETT - 118840 ST, 118431 BR, 189132 NF ARMSTRONG - 812961-011, 812961-041, 812961-111 FITS FOLLOWING: BELL & GOSSETT - 100 (75-150) ARMSTRONG - S-25