Because they use a 5 sided wrench to open the valve.
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A Pentagonal Prism has 7 faces; it has 5 side faces and it has 1 on the top and on on the bottom. 5+1+1=7
A pentagonal pyramid has 6 faces. It has 10 edges and 6 vertices. It looks just like a pentagon on face and has a point at the top.
Ten. There are 5 edges on the base of the pyramid, plus one more edge for each of the 5 corners of the pentagon to the top of the pyramid.10. the 5 edges of the pentagon and the 5 going up to the point.It has 6 vertices- five for the pentagonal base and one at the top.
It could be a pentagonal pyramid, but there are other possible shapes.
A pentagonal rotunda has 20 vertices