![Amazon.com: Steelman No. 4 Sized Steel Radiator Test Adapter Cap Replacement for Steelman Cooling System Test and Purge Kit : Automotive Amazon.com: Steelman No. 4 Sized Steel Radiator Test Adapter Cap Replacement for Steelman Cooling System Test and Purge Kit : Automotive](https://m.media-amazon.com/images/I/71G6lTniKZL._AC_UF894,1000_QL80_.jpg)
Amazon.com: Steelman No. 4 Sized Steel Radiator Test Adapter Cap Replacement for Steelman Cooling System Test and Purge Kit : Automotive
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How to make your street car's cooling system race and track-day ready. - Professional Awesome Racing - Time Attack and Downforce Specialists
![Went to go top off my coolant, cars cold but the cap is real tough. Just wanna make sure I don't need to relieve pressure in case the top pops off : Went to go top off my coolant, cars cold but the cap is real tough. Just wanna make sure I don't need to relieve pressure in case the top pops off :](https://i.redd.it/k9nz2ttfa4y81.jpg)