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Removing check valve on hydro on 7012

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They are usually used where there is not enough clearance to use the much larger standard 6 point head.

Like the 3/8" socket is much smaller than the standard 9/16" would be for that size bolt. They are usually a harder grade to not strip with the much smaller contact surfaces.

My guess is the inventor wanted a large bolt with a small head, but for whatever reason didn't want an allen head ???

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Thanks, finally got it out. The right side was not to hard, you can not get a socket on the left because an allen head is in the way. Had to carefully use vice grips. Don't like to use vice grips but knew no other way. I guess because of the allen head being in the way is why they used the star head. Know to get them unstuck.

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