Assembly constraints restrict the movement of components relative to each other. Apply all constraints necessary to fully constrain each part so as to leave no degrees of freedom.
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Mate the Port A Union Cap to the Block
Create
a Mate Constraint, between:
If, after creating the constraint, the union cap is hidden within the block, click and drag the union cap away from the block. You can click and drag any part within an assembly and it moves if it is under-constrained.
Your assembly should now look like the image to the left, with the flat surface of the port facing the block...