The good old drain on my original water pump leaked like a strainer. I installed this new water pump along with a Gates 33910 thermostat housing on a 2003 5.3 liter Chevrolet Suburban with no problems. Both the water pump and thermostat housing come with a thermostat housing o-ring. So if you're using your original thermostat housing, there's no need to order a new O-ring. I see reviews saying otherwise, but I have two gaskets for the block as well as an o-ring for the thermostat housing. Everything I needed was included. All original equipment fits and syncs perfectly, hoses and all. Some seem to have issues with their screws rusting. Maybe it's the geography, but here in California I've reused everything with no problems. The role is strong, nothing dangles. There is also no creaky creaky. Gates seems to have a good name and it was the best price I could find at the time of purchase. I'm happy with them so far. UPDATE: A few tens of thousands of miles later and it's still like new. However, it is recommended.
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