Water pump mechanical seal.
This is the steel cap and spring side of the seal only and does not come with the ceramic side of the complete seal assembly. Similar to Volvo Penta sealing ring used on coolant circulation pump.
MTU 94485 - 129-22-1-03278
(A) Steel Cap Dim = 37 mm
Shaft Dim on side (A) = 15 mm
(B) Seal Face Dim = 32 mm
Shaft Dim on side (B) = 15.5 mm
Compressed height of seal = 19.9mm / STD Height 22 mm
Made by Ancor of Italy. Part number AN 6997.