2" split compression nut 0121108020 is a heater union split nut with 2 inch buttress thread connections for 2 inch id heaters. Replaces other 2 inch plumbing heater split nuts like
DISCONTINUED: SEE 400-5161 or 0121108020. DISCONTINUED - see 400-5161 Waterway Brand part discontinued, see MP 0121108020 Split Nut Waterway 2" Heater 415-5161