SINGLE CARTRIDGE MECHANICAL SEALS Apex S1 : Single Cartridge Seal w/ Flush Hydraulically balanced design handles pressure reversals & vacuum. Product Data Sheet Apex S1BB : Single Cartridge Seal / Big Bore Easy cartridge installation w/ enlarged gland to fit standard big bore pumps. Product Data Sheet Apex S1CVD : Single Cartridge Seal w/ CVD Gland Incorporates circulation, vent, & drain gland for quenching & safety. Product Data Sheet Apex S1WBC : Welded Bellows Cartridge Seal Universal gland design conforms to most common bolt circles & fits all ANSI pumps w/o modification. Product Data Sheet Apex HDS : Single Cartridge Seal / "Heavy-Duty" High-Pressure Heavy-duty construction can replace double seals in many applications. Product Data Sheet PPC 1101 : Single Cartridge Seal Cartridge design for quick & easy installation – fits standard ANSI pumps w/ no equipment modification. Product Data Sheet PPC 1500 : Single Cartridge Seal / Universal HD Slotted gland fits most pumps, particularly ANSI pumps –