As seal system for standard chemical pumps with conically opened sealed space, HRC N series features rotating counter ring against stationary seal face. Double seal version, HRC3300N, employs stationary seat that does not require binding and atmosphere side to facilitate servicing. Omission of binding enables use of DiamondFace diamond coating, and operating temperature increases to +392°F. Seal faces are of silicon carbide, and stationary seats are of carbon materials or silicon carbide.