The TCD+a range of oil fill plugs are characterized by its flat, phosphate steel dipstick. These plugs are made with reinforced, glass-fiber polyamide based (PA) technopolymer, giving the plugs resistance to oils, greases, solvent and other chemicals.
The TCD range has two main plug models, namely, the TCD a, which has no side hole; and the TCDF a, which has a side breather hole with a 2mm diameter.