Cost, Durability, and Safety

Cost: $40 - $50, Additional part sets could be sold for $15 - $25

Durability: The pieces would need to be made out of a strong plastic in order to stand the test of time. However, the weak point would be the rubber sealing pieces and their attachment to the plastic parts. Also, the parts would need to be left out to dry which may be hard if many pieces are used.

Safety: There are small parts in this set, so this would only be for children over 5. Additionally, since this is a water toy, parental supervision would be required. However, children in this age range (5 - 10) are almost always supervised when they are near water (in the bath, at pools, etc).