China Hand pump question ?

Just curious if anyone knows the size of the oring in the bottom of the check valve in these China pumps? They just don’t last (about the only o ring in the thing that doesn’t) and I’d like to be able to order just this one instead of whole kits off eBay. Here is the pictured of the part. It’s the small o ring on the end. Thanks.

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The [previously] unopened Chinese pump in my closet has two -006 O-rings in the spare parts bag. Surprised the size is not metric but the cross-section is 0.070" so it's definitely a standard. I'm sure it's for pump rod of the final stage but possibly also the check valve. All the others are considerably larger so that's the only one that could possibly be for the check valve.
 
The [previously] unopened Chinese pump in my closet has two -006 O-rings in the spare parts bag. Surprised the size is not metric but the cross-section is 0.070" so it's definitely a standard. I'm sure it's for pump rod of the final stage but possibly also the check valve. All the others are considerably larger so that's the only one that could possibly be for the check valve.
Ok thanks. Yeah I’m pretty sure they are the same size.