Covered Model Steam Engine Safety Valve

Here are 8 variations on a 'covered' style safety valve. Variations include all combinations of:
"Bare tops" or Fully Covered Valves:
- this is just your stylistic preference. Both are valid valves you can find on real locos.
"Control Lever" or no control lever
- stylistic preference. The control lever is modelled as very long. Print it, figure out how close you need the valve to the cab, then cut the control lever with a pair of snips to achieve the correct distance.
"Flat Bottoms" or "Concave Bottoms"
- flat bottoms go on a square-topped firebox. Concave bottoms go on a round firebox

These are designed for OO scale.
No locating pins in the print.