Replaces OEM# for Bell & Gossett: 118705, 189110 and old #PZ4291 Description: Cast Iron, 1/2" x 1/2", spring type Compatible with Bell & Gossett: 1/12 hp Series 100, 1/6 hp HV, or PR and Armstrong S25, 34, 35, H32, & 41 Circulator Pumps OEM part 118705 Coupler Cast Iron assembly Compatible with Bell & Gossett Series 100 Inline Booster Pumps. Replaces Bell & Gossett 118705, 189110, PZ-429 - PZ-4291. Armstrong 806026-001. Hydrovalve RM-876. Sid Harvey 156, 156B, 156C. Strainer Screeen & Cylinder SSC-779, 118705. Westwood H24-10, PD-40. Dayton / Grainger 4RD81. OEM