Western Pacific DripLess Moldable Shaft Packing Kit for Up To 1-1/2" Shaft. The economical answer to leaking stuffing boxes as well as leaking rudder stuffing boxes. The Drip Less moldable kit is a combination of TEFLON (PTFE) moldable packing and TEFLON (PTFE) paste. This combination of materials forms a perfect self-lubricating seal within the stuffing box keeping water out. Standard shaft packing is used as a retainer to hold the moldable packing in place in the stuffing box and is not included in the kit. Some high speed shafts may exceed the performance limits of the DripLess kits, so it is important to compute the performance formula shown, to be sure the kit will perform for each specific application.