LEGO 5109 Pneumatic Tubing and T-Junctions is a vintage Service Packs set from 1989 valued at $15 for new and sealed sets, up 357% from an original retail price of $3.25. Annual appreciation has averaged 2.91% since release. Used copies are valued between $11 and $18 depending on condition.
LEGO 5109-1 Pneumatic Tubing and T-Junctions is a Service Packs Technic set released in 1989, containing 6 pieces. It supplies 4 mm diameter pneumatic hoses including a black 128L (102.4 cm) length, a trans-clear 76L (60.8 cm) length, and a light gray 76L (60.8 cm) length. The pack also includes two light gray pneumatic T pieces, the first-version T-bar and the later T-bar with a ball in the center. It was intended for maintaining or expanding Technic pneumatic builds.
A new and sealed Pneumatic Tubing and T-Junctions is currently valued at around $15, with annual growth of approximately 3%. The average used price is $12 for those in good overall condition. Based on current trends, this set could be valued near $15 within the next year. New and sealed listings currently range from $14 to $20.