How does the Libero work in sitting volleyball?

Question

Accepted Answer

A team may designate up to two Liberos, who are specialist defensive players. Only one Libero may be on court at a time.

A Libero may replace any back-row player.
A Libero may not serve, block or attempt to block.
A Libero may not complete an attack hit if the ball is entirely higher than the top of the net at the moment of contact.
Libero replacements are not counted as substitutions and are unlimited, but there must be a completed rally between two replacements involving a Libero.
Replacements happen only while the ball is out of play and before the whistle for service, and only through the Libero replacement zone.
A Libero must wear a uniform with a different dominant colour from the rest of the team, numbered like the rest of the team.
The Libero counts toward the court limit of one VS2 player, so the six players on court must still meet it.

Source: World ParaVolley Official Sitting Volleyball Rules 2025-2028, Rules 7.3.1 and 19.