THIS IS A NEW SET OF 5 STANDARD TEFLON ROPE PACKINGS THAT WORK IN MANY A/T, BERKELEY, AND DOMINATOR PUMPS. IF YOU ARE STARTING TO GET A LITTLE MORE WATER IN AROUND THE SHAFT PACKING THAN YOU LIKE AND YOU KNOW THE PACKING IS TIGHT, OR MAYBE NOTICING A LITTLE MORE IMPELLER SLIP ON ACCELERATION, CHANCES ARE THE SHAFT PACKING IS DUE FOR REPLACEMENT. PACKING CAN BE REPLACED WITHOUT PUMP REMOVAL OR DISASSEMBLY. EMAIL ME WITH ANY QUESTIONS.