Technic Pneumatic "mini pump?"

[technical]

I bought this blue item advertised as "Mini Pump Double Valve" on eBay

http://www.ebay.com/itm/301854575416

It does not seem like a pump to me. It works like an actuated piston.

Is the blue cylinder supposed to be a pump?

[syclone]

It is a small actuator.

I believe it came in education sets

Edited February 1, 2016 by LXF

[Zerobricks]

Yep, thats a small cylinder. Pump has only one output and is slightly longer.

Edited February 1, 2016 by Zblj

[Milan]

Is the blue cylinder supposed to be a pump?

No, it it small pneumatic cylinder, same as the yellow one in your picture, just transparent.

[M_longer]

You have bought small cylinders :)

Pumps have single port:

They come in three versions, one 5.5L and two 6L:

http://alpha.bricklink.com/pages/clone/catalogitem.page?P=x191c01#T=C

http://alpha.bricklink.com/pages/clone/catalogitem.page?P=99798c01#T=C

http://alpha.bricklink.com/pages/clone/catalogitem.page?P=19482c01#T=C&C=7

[andrewganschow]

I tell you what a 6L pump with double outputs would be cool, every stroke would be generating pressure. Oh dear lego gods please make this part come true. And I don't think that would be to hard to accomplish either, a check valve on output.

[technical]

Thanks everyone! The eBay listing was wrong.

[higgins91]

I tell you what a 6L pump with double outputs would be cool, every stroke would be generating pressure. Oh dear lego gods please make this part come true. And I don't think that would be to hard to accomplish either, a check valve on output.

it is not technically possible, it would take an air inlet that would move at the same time that the seal !!

[doug72]

It would require Suction and discharge valves at both ends, I.e 4 valves in order to be double acting.