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Press F7 to open the Domain Explorer, and expand the hierarchy to the hook-up type level in the Hook-Ups folder.
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In the Explorer tree view, select a specific hook-up. Select a hook-up type, and then select and right-click one or more hook-ups.
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On the shortcut menu, select Properties.
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On the Hook-Up Properties dialog, from the Hook-up sub-library list, select a user-defined hook-up item sub-library.
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Select Pipe Specs to display pipe specs associated with the user-defined sub-library that you selected.
The Pipe Specs button is only available when the sub-library that you selected is user-defined.