Hand operated pet cocks for expelling air from heating systems have been superseded by:
a. Steam traps
b. Diverters
c. Automatic air vents
d. Check valves
e. Pipe siphons
Answer: C
Hand operated pet cocks for expelling air from heating systems have been superseded by:
a. Steam traps
b. Diverters
c. Automatic air vents
d. Check valves
e. Pipe siphons
Answer: C