P/N: 3311 (Blank), 3312-1 (Mixture), 3312-2 (Carb. Heat), 3312-3 (Cabin Heat/Vent), 3312-4 (Rear Seat Heat), 3312-5 (Windshield Heat/Defrost), and 3312-6 (Fresh Air)
Price: $11 each
Eligible On: Piper PA-18 Series Aircraft
STC: N/A
FAA/PMA: Supplement 1 (covers Blank and Mixture), Supplement 1 (covers Blank and Cabin Heat/Vent)
Weight: .5 oz.
Material: Plastic knob with brass threads.
Purpose: 3311 and 3312-1 are direct replacements for Piper P/N 471-053; 3311 and 3312-3 are direct replacements for Piper P/N 471-060.
Installation: Screws on.
Better photo coming soon.