I have had very good experiences with the NEW Gates pumps and they make a replacement tube as well. I have installed them in 17 4.0 engines over the last 4 years and had no comeback failures.
I finished the water pump replacement with the Graf Aluminium pump. Nice pump. As per Qmulus recommendation, I replaced the coolant sensor Oring with OEM. While in the process, I replaced the oil filter housing along with a new oring for it.
I have a Gates part with a plastic impeller in my car now and it's been attached to that motor since late 2015 with no issues when it was in my e34 and isn't showing any issues now in my E30.
I have been running the Graf AL pump for about 10k so not long enough to give a full assessment, but the quality was awesome and very pleased with it.
Graf does make an AL housing pump which I used this last time. Time will tell if it holds up better the the Rein plastic AM one installed in the CC.
I think I'll just grab a GRAF 30mm unit and compare unless someone has good info on brand quality/fitment.
Mine broke in less than 500 miles and their replacement broke too (which I paid for till I returned them the faulty one back) in less than 500 miles on an Audi A1. Now they have my money for 2 water pumps and I paid for labour costs of replacing twice, and waiting for a refund decision for more than a month. AVOID!!!
Don’t use a Gates kit or if you do purchase the Gates kit without the water pump and get a different brand water pump. Gates water pumps have an enormously high failure rate in the last several years and it sucks to have to do the job twice.
Water pump failed on the gates timing belt kit and engine shredded only 16000 miles on it
Gates water pump failure
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