Knuckle Coupler Lubricant - High Viscosity for O and Larger Scale Knuckle Couplers

 Do you ever Lube your operating couplers? Most people do not, yet they are the components on model railroads that fail to operate properly most often. Just because they may be made of a "slippery" plastic", that does not overcome, dirt, grime, and pet hair buildup in the coupler's working mechanism. And, of course, many of the larger scale couplers have some die-cast parts where metal rubs on metal.