I don't trust those rubber caps and usually drive the nipple out then unstall a freeze plug. The nipples don't come out easily so in your situation with the water pump already installed the cap is probably the only reasonable option.
Jeff
Visit our community sponsor
I don't trust those rubber caps and usually drive the nipple out then unstall a freeze plug. The nipples don't come out easily so in your situation with the water pump already installed the cap is probably the only reasonable option.
Jeff