OE Stanadyne Roosa Return Check Ball 21251

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Condition: We ship our Roosa Return Check Ball 21251 brand new, never before used, and in OE packaging.

Female end is 1/8″ pipe thread

Male end is 7/16 X 20″ Standard thread with o-ring

Note: If this check valve is getting clogged with black partials or has been broke out it usually means pump needs to be rebuilt.

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Fitment Guide:

And do the wrench test, if a 9/16″ wrench fits you old valve this is more likely to be correct. If you old is a 1/2″ you likely need our valve 15830

But please keep in mind that the valve is designed to allow some fuel to pass. Making it a self bleeding system. If you look at the ball seat close there is a tiny cut to allow this to happen. The purpose of this item is to create a small amount of pump housing pressure while running, not to stop all fuel flow in either direction.

In most cases this valve DOES fit all pumps with model numbers that start with:

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In most cases this valve DOES NOT fit pumps with model numbers that start with:

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Remember, if you are not sure if this check valve is right for your application, please send us your complete pump model number.  We are here to help!

You can call us, use our contact form, or even send us an email directly ([email protected])

Thanks!