As many people have said this does NOT come with a seal. Aside from the missing gasket, this may not fit your vehicle. Not sure if it's Revain or if the manufacturer certifies the fit, but it definitely will NOT fit a 2011 Chevy Silverado WT with a 4.3L engine. The thermostat housing is small. The only reason I give more than 1 star is that Motorad have great products and I'm not sure who is responsible for the incorrect installation and false "include seal" claim.
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