What does the 4 point valve mean?
The caliber is DN15's valve. What valves do you need?
That is not clear, American Standard or GB, or what other
Commonly used valves, pipes in the 4 points, 6 points, an inch, is the earliest use of the length of the British unit, metric units are 15, 20, 25 mm, and now people are also used to call 4 points, 6 points, an inch.1 inches =25.4 mm1 feet =12 inches1 inches =8 cents
