Duplo Brick Round 4 x 4 Dome Top with 2 x 2 Studs [Plain]

Reference

98220

Duplo Brick Round 4 x 4 Dome Top with 2 x 2 Studs [Plain] (part 98220) is a LEGO element. CollectORbuild's catalog records it in 2 sets, including Giant Tower and Toddler Starter Building Set.