Does anyone know the size of the Oring that goes inside the female quick disconnect piece .thanks in advance
O rings
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Not sure what size but this was my order from Airtanksplus.com a few months ago. I've used one so far and it worked perfectly.
"Female Quick Disconnect Orings (10)pcs (ORING-F-FOSTER) x 1"
"Female Quick Disconnect Orings (10)pcs (ORING-F-FOSTER) x 1"
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The standard AS568 part number for that O ring is "010". They can be bought at oringsandmore.com for a penny each. Here is a link.
www.oringsandmore.com
Buna Orings # 010-70D FDA/NSF61 Minimum 100 pcs
1/4 ID X 3/8 OD X 1/16 CS - Price is for 100 pieces
www.oringsandmore.com 
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Agreed, the picture is a genuine Foster brand coupler so a -010 is what you want. Generics will usually also work with a -010 but in some cases may require a metric M2 x 6 to seal properly. It's very close to a -010 except about ten thousandths thicker.
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Would the M2x6 oring be whats required on the yong heng female quick disconnect fitting? it requires two and they seem fatter than the -010 orings. I have a pack of 100 of the -010 but they are not the same thickness.
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Not sure if exactly right but I bought these at Home Depot and can say they have worked in both my China hand pump foster fittings. Danco #5 orings.
DANCO #5 O-Ring (10-Pack) 96722 - The Home Depot
The DANCO Spout #5 O-rings makes it easy to repair leaky faucets. These O-rings help eliminate leaks at the base of the spout. They are designed to be compatible with Price Pfister, Kohler, Wallaceburg
www.homedepot.com
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Thanks for the reply. I had some extra that came with the yong heng so i took out the calipers and this is what I came up with. https://www.oringsandmore.com/buna-90-o-rings-4-3-x-2-4mm-minimum-25-pcs/
Although i have a few i went ahead and placed an order.
Although i have a few i went ahead and placed an order.
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