Best automotive emission air check valves according to redditors

We found 3 Reddit comments discussing the best automotive emission air check valves. We ranked the 2 resulting products by number of redditors who mentioned them. Here are the top 20.

1. ZKer 3Pcs 8mm 5/16" Chorme Aluminum Fuel Non Return One Way Check Valve Petrol Diesel, Fuel Check Valve for Water Petrol Diesel Oils, One-Way, Non-Return

1 mention
ZKer 3Pcs 8mm 5/16" Chorme Aluminum Fuel Non Return One Way Check Valve Petrol Diesel, Fuel Check Valve for Water Petrol Diesel Oils, One-Way, Non-Return
Made of high quality material, durable, for long time useDiameter: 8mm ( 5/16") fit for Carburettor and low pressure fuel systemsFunction: Arrow marked on valve, showing fluid flow direction, prevent fuel from returning back to the tank and keeps it in the lineGreat for water pressure pumps and gall...
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2. Black Menba Aluminium One Way Non-return Check Valves for Water Petrol Diesel Oils pack of 2 (8mm 5/16")

1 mention
Black Menba Aluminium One Way Non-return Check Valves for Water Petrol Diesel Oils pack of 2 (8mm 5/16")
Used on pop up camper to keep on boad water pump from pumping water to outside hose connection works fine.Easy installation and replacement.Compact and effective.keep fuel from flowing back to the tank.
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Top Reddit comments about Automotive Replacement Emission Air Check Valves:

u/wobblyparadox · 11 pointsr/SpaceBuckets

Combination of parts from Amazon and ebay. Not all of them are necessary, fittings and Brute trashcans and such are from Home Depot.

u/Hammerpike · 1 pointr/Homebrewing

I'm building out an upright keezer and I bought these to put in the gas lines a couple inches above the ball lock disconnect hose - https://www.amazon.com/gp/product/B0759WWHRR/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1