Ball valve with visual stem-cap engagement

A valve comprising:

• a valve body defining a first end, a second end, an interior surface, and an exterior surface, the first end defining a first opening and the second end defining a second opening, the interior surface defining a main bore extending from the first opening to the second opening, the main bore defining a fluid path from the first opening to the second opening, the valve body comprising a stem portion defining a stem bore intersecting the main bore;
• a valve sealing element positioned inside the valve body;
• a stem positioned inside the stem bore of the valve body, the stem comprising a first end and a second end, the first end of the stem engaged with the valve sealing element;
• and
• a cap comprising
• a mounting end defining a stem engagement cavity;
• an actuating end distal from the mounting end, the cap defining a window in a position between the mounting end and the actuating end, the window exposing a surface of the stem, the window being a first window, the cap further defining a second window, each of the first window and the second window exposing a surface of the stem distal from the first end of the stem;
• and
• a rotation tab defining a first side surface and a second side surface and a top surface, the first window extending from the first side surface to the second side surface of the rotation tab, the second window extending from the top surface of the rotation tab and intersecting the first window, the rotation tab further defining an engagement hole;
• and
• a locking tab.