Description
Pop Up Ball Transfer (PBT) is manufactured in US by Omtec Corp. 

Material
Pop up ball are available in Stainless Steel & Delrin
Galvanised Steel Cylinder 
Brass Air Inlet 

Application
This PBT is pneumatic which require filtered, regulated and lubricated compressed air to operate 
PBT can easily fit into conveyor roller or table top layout

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For more information, please visit their offical website
http://omtec.com/catalog/pbt-ball-transfer/