Drag Needles
It is an indicator (witness) of the maximum fluid pressure recorded on the pressure gauge.
Drag knob: Aluminum
O-ring: Viton
Sight glass:
- Glass: 2", 2 1/2", and 3 1/2"
- Acrylic: 4", 4 1/2", and 6"
Bushing: Brass
Needle: Aluminum with red paint
