Quick view Knight Equipment Knight Equipment Roller Block Assembly RB-850 for KP-800 Series Pumps using T-50 and T-66 Tubes, P/N 7633330 MSRP: $54.01 Knight Roller Block Assembly RB-850 Replacement For KP-800 Series Pumps, Yellow Rollers. Used with Knight Pump Tubes: 7019060, 7018068, 7018042, 7018046, 7018047, 7018002, 7018011,... MSRP: $54.01 Add to Cart The item has been added Add to Wish list Compare