non-threaded FI Series Diesel Fuel Injector Cap FI Series diesel fuel injector caps protect from impact damage and keep out moisture and contaminants during shipping or storage. * Economical protection * One size fits all standard injectors Material: Low-Density Polyethylene Color: Blue EZC Series Non-Threaded NPT Caps EZC Series non-threaded NPT caps are a heavy-duty, tapered, multi-use cap designed to protect a variety of items. The flange allows for easy insertion and removal. Material: Low-Density Polyethylene Color: Orange FTC Series Caps For Flareless Tube and Nut Assemblies FTC Series caps for flareless tube and nut assemblies feature a "cap within a cap" design. The design allows the outer cap to conform to the hex shape of the nut while the inner cap covers the tube and sleeve inside the nut and holds the assembly firmly in place. Material: Low-Density Polyethylene Color: Red 44 * For other material and color options, contact customer service.