Duplo Door / Window Frame 4 x 4 x 3 with Thin Top

Reference

18857

Duplo Door / Window Frame 4 x 4 x 3 with Thin Top (part 18857) is a LEGO element. CollectORbuild's catalog records it in 5 sets, including Bluey’s Family House and My First Farm. It has been produced in 6 different colors.