These are used to block off heater cores, intake manifold fittings, water pump hose fittings, etc.
Please choose your size using drop down menu above.
Single sizes sold individually.
Or choose the combo pack which includes two 5/8" and two 3/4" bypass caps.
2 of each size is required to block off most GM heater cores and water pumps.
5/8" Measures: ID 5/8", OD 15/16", Length 1-1/16"
3/4" Measures: ID 3/4", OD 1", Length 1-1/2
Combo Pack Includes: two 5/8" and two 3/4" bypass caps.