Note : Split nut is required when replacing “old” clamp-style multi-port valve (Horizon # 26-270-1510) with new style valve (# 26-270-1520).
505-1960 and 505-3030 are the same part. Difference is 1960 is without the screw, 3030 is with the screw. 505-1960 + 819-0022(the screw) = 505-1960. For the split nut, order 505-3010(31-270-1213). For the threaded sleeve, order 505-3000 (31-270-1211). For split nut and sleeve assy, order 505-3020 (31-270-1217).