LEGO 9641 Pneumatics Add-On Set is a Education set currently valued at $251 for new and sealed sets. Annual appreciation has averaged 7.36% since release. On the used market, values range from $137 to $231 based on condition. Secondary market prices for new and sealed sets typically fall between $199 and $280. Momentum for the set is holding level for now, in spite of recent gains in value.
LEGO 9641-1 Pneumatics Add-On Set is a 31-piece Education set released in 2008. It was designed as an expansion for the Simple & Powered Machines Set 9686 and includes a selection of pneumatic components such as pumps, cylinders, switches, tubing, an air tank, and a manometer. The set also comes with full-color building instructions for four real-life pneumatic models. Its parts assortment includes several specialized pneumatic elements, including trans-light blue pumps and cylinders, dark bluish gray switches, and a trans-clear pressure gauge.
A new Pneumatics Add-On Set sells for around $251 today, after averaging 7.4% growth a year since retirement. Give it five years and our forecast has it near $288. The average used price is $208 for those in good overall condition. New and sealed listings currently range from $219 to $300.