Magic Plastics 0121108015 Split Nut for Heater Union 1.5" FBT.
Used on older Heaters that used a Stainless Heater Manifold: 6540-775 on 1984 601 and 1985 602 Heaters. Tailpiece from Heater to Pump.
Has large Flange with screws for Metal Housings. Not to be used for a Pump Union only