Conn. Agencies Regs. § 29-232-61
No outlet connections, except for damper regulator, feedwater regulator, low water fuel cut-out, drains, steam gages, or such apparatus that does not permit the escape of an appreciable amount of steam or water therefrom, shall be placed on the piping that connects the water column to the boiler. The water column shall be provided with a valved drain of at least three-fourths of an inch pipe size, the drain to be piped to a safe location. Each boiler shall have three or more gage cocks, located within the range of the visible length of the water glass, except when such boiler has two water glasses with independent connections to the boiler, located on the same horizontal line. Boilers not over thirty-six inches in diameter in which the heating surface does not exceed 100 sq. ft. need have but two gage cocks. Electric boilers need not be fitted with gage cocks. The gage cock connections shall be not less than one-half inch pipe size. When the direct reading of gage glass water level is not readily visible to the operator in his working area, two dependable, indirect indications shall be provided, either by transmission of the gage glass image or by remote level indications.
Conn. Agencies Regs. § 29-232-61