Silicone Heater 5/8" 16 mm Cap Black Block Off Plug Single

the reinforced silicone heater block off capsis designed for coolant, water, air, vacuum ports, throttle body water ports, heater cores, and much more. While they look a lot like traditional vacuum caps, the internal material is designed specifically to be installed on your cooling system. The block off caps is manufacturedjust like our reinforced silicone heater hoses. With 3 layers of polyester webbing for reinforcement, you can be sure that they will withstand the high temperatures and pressures of your cooling system for years to come.

these silicone block off caps are not compatible with fuel, oil, or any petroleum-based products.