From Pumpsolutions

Seal

...Viton Silicon Carbide/Silicon Carbide - 1 3/4" - Type 21

The Viton (Ni-Resist)Silicon Carbide/Silicon Carbide seal is for SERVERE DUTY.This seal performs well in oils, acids and chemical applications. The silicon carbide rotating ring in the head of this seal is significantly harder than the carbide ring found in the carbide/silicon carbide and ceramic seals. This hard ring riding against a silicon carbide seat offers greater protection for thermal conductivity and lower coefficient of friction, resulting in the coolest running seal available. The carbide against carbide offers the hardest materials for the mild to servere abrasive applications. While viton performs well with most chemicals, it does not perform in steam applications. Contact factory for liquid compatibility with viton. Max temp if 240 Deg F.

For use with Scot Pumps 20 - 30 HP at 3500 RPM; JM Frame
MODEL #'s

55 & 55F 56 & 56F

For use with Scot Pumps 20 - 75 HP at 3500 RPM; JM Frame
MODEL #'s

57 59

For use with Scot Pumps 10 - 25 HP at 3500 RPM; JM Frame
MODEL #'s

62

For use with Scot Pumps 15 - 50 HP at 3500 RPM; JP Frame
MODEL #'s

102 103

For use with Scot Pumps 30 - 100 HP at 3500 RPM; JP Frame
For use with Scot Pumps 5 - 20 HP at 1750 RPM; JP Frame
MODEL #'s

63

For use with Scot Pumps 40 - 100 HP at 3500 RPM; JP Frame
MODEL #'s

104 105

For use with Scot Pumps 7.5 - 15 HP at 1750 RPM; JP Frame
MODEL #'s

103 104 105

For use with Scot Pumps 7.5 - 30 HP at 1750 RPM; JP Frame
MODEL #'s

93 94 95 96

For use with Scot Pumps 10 - 30 HP at 1750 RPM; JP Frame
MODEL #'s

267

For use with Scot Pumps 30 - 50 HP at 1750 RPM; JP Frame
MODEL #'s

97