Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: Geax MTB Latex Presta Tube
Product description: Top performance MTB latex tube amazingly light, supple and puncture resistant. presta valve with a removable valve core for easy insertion of sealant. Geax tubes will elevate to the next level. GEAX since 1995.
Product feature: Ultralight latex tube, High performance, Presta valve
Product brand: Geax
Target attributes: Valve Type
Answer: attribute: valve type
value: presta valve
source: product feature
attribute: valve type
value: presta tube
source: product title
attribute: valve type
value: presta
source: product description