Now I can see the picture, any auto parts store will have a piece of coolant hose to fit that.
Remember to burp the system. I like Peak Global 50/50 premix, that's what I topped mine off with.
212,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
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