This is a funnel with a set of adapters to ensure a tight fit on the radiator filler neck. When bleeding the cooling system, the funnel serves as a reservoir for additional coolant that drains into the radiator through the escape of trapped air. After pumping, the funnel mouth can be closed with the plug provided. This allows unused coolant to be poured back into the original container. All included accessories fit inside the funnel and can be stored when the funnel is not in use. The snap lid keeps everything in place. The product is very well thought out. I used it on a 1993 Acura Integra with no problems. There are a number of 1 star reviews here from people who have found that none of the adapters supplied work with their vehicle. Do not let this deter you from purchasing the product. Anyone with a little ingenuity and mechanical skill should be able to make a custom adapter out of a replacement radiator cap and various parts purchased from Home Depot's plumbing department!
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