Shower Valve Penetration in 1/2-Hour Fire Barrier?

A dormitory has 1/2-hour fire barriers separating each residential unit. On each side of the 1/2-hour wall, penetrating the 5/8" gypsum, are shower valves that serve showers within bathrooms on each side.

The shower valves have the valve assembly itself and an opening that's covered with a metal escutcheon. These would qualify as a membrane penetration under the International Building Code.

For back-to-back vales in the wall, how is this commonly addressed to still maintain the 1/2-hour fire resistance rating?

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