silcock leaking

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I have silcock(anti siphon frost free) leaking. Water leaks out of the valve.
I have replaced the gasket of the stem in the other silcock valve. But I can not figure out which brand this is. Only thing I can read is ASSE 1019-A. I guess it is some of standard not a brand. How can I buy its part?
Thansk.

 

[SewerRatz]

A picture would be a great help.

 

[Sponsor]

 

[Redwood]

ASSE 1019-A is only a standard which all manufacturers are required to meet.
It does nothing to tell us who made the valve.
As suggested by SewerRatz a pic is needed.

 

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Here is the handle and the cap.

 

[Cass]

try a clear close up pic of the part that is leaking...those are pretty generic handles used on a lot of china imports...

 

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I believe that gasket or packing is broken. I can't get it out unless I shut the whole water in my house out. I just want to replace the gasket. Will the Mansfield work?
Thanks.