Used to fill the external bond Plugging Compound Kit Sleeves (79488 or 79499) in hard-to-reach areas or in vertical plugs where there is no space available to connect the plugging compound kit directly to the sleeve. The hose is 15″ long to allow clearance in tightly racked cables. Single-use extension, incorporates a second check valve to prevent the hose from draining during filling. Tested to withstand the pressure applied when building a block.