1" FPT 2nd stg Indust Regultr 1/2" orifice, 6" to 14" WC
1-1/4" FPT 2nd stg Indust Reg 1/2" orifice, 6" to 14" WC
3/4" FPT 2nd Stage Indust Reg 1/2" orifice, 6" to 14" WC