Hi forum,

Im purchasing 3rd party hose for my lego pneumatic models, and I'm not sure about the inner diameter that the hoses need in order the properly fit the Lego Pneumatic pieces. 

The smallest industrial size on amazon I could find was 2.5 mm, so would that fit lego pneumatics?

Thanks

It's smaller than that, about 1.5 to 2mm. I've bought some replacement tubing from http://www.blokbricks.com/contents/en-us/d2.html in the past, very good stuff. Can buy long lengths in a variety of colours if needed.

Edited March 31, 20231 yr by allanp

I bought 4mm (outer diameter) tubing a while ago from a local hardware store specializing in plastic products, and it fits perfectly, though it's somewhat softer than the Lego hoses.

Did buy these last year, the same as Lego hose: https://nl.aliexpress.com/item/4000843248465.html?spm=a2g0o.productlist.main.5.76bf7709KVxMSb&algo_pvid=76d355a8-3ad3-4d4d-92af-fb4826c5c8ed&algo_exp_id=76d355a8-3ad3-4d4d-92af-fb4826c5c8ed-2&pdp_ext_f={"sku_id"%3A"10000009107952793"}&pdp_npi=3%40dis!EUR!1.4!1.08!!!!!%402100b18f16802965632645591d0702!10000009107952793!sea!NL!163161168&curPageLogUid=OLW6P2L3UIKh

On 3/31/2023 at 11:03 PM, onzenuub said:

Did buy these last year, the same as Lego hose: https://nl.aliexpress.com/item/4000843248465.html?spm=a2g0o.productlist.main.5.76bf7709KVxMSb&algo_pvid=76d355a8-3ad3-4d4d-92af-fb4826c5c8ed&algo_exp_id=76d355a8-3ad3-4d4d-92af-fb4826c5c8ed-2&pdp_ext_f={"sku_id"%3A"10000009107952793"}&pdp_npi=3%40dis!EUR!1.4!1.08!!!!!%402100b18f16802965632645591d0702!10000009107952793!sea!NL!163161168&curPageLogUid=OLW6P2L3UIKh

Bought the same type and they works perfectly.

On 3/31/2023 at 7:54 PM, allanp said:

It's smaller than that, about 1.5 to 2mm. I've bought some replacement tubing from http://www.blokbricks.com/contents/en-us/d2.html in the past, very good stuff. Can buy long lengths in a variety of colours if needed.

Like 2 years ago I bought pneumatic tubes from this place as well, works great.