When you need a used nitrogen membrane for a high-demand draught beer system in the filtration separation space, the first thing to sort out is whether the two Green Air listings offer anything different besides the price. Both are sold as nitrogen membrane separators for medical, industrial, processor, and beverage use. Both are used, both are from Green Air, and both are described as the membrane only-not the compressor and tanks that may have originally been attached. That leaves one meaningful comparison: the listed price.
Quick verdict
The lower-priced listing is the clear pick if you are comparing only what is stated. The two product descriptions match on every point: same used condition, same Green Air brand, same 200 PSI rating, and same membrane-only configuration. When the only difference is the listed price, the lower-priced unit gives you the same described equipment for less money. There is no listed feature, included component, or condition detail in the higher-priced listing that is missing here.
At a glance
Here is how the two listings line up at a glance.
| Product | Listed price | Price comparison |
|---|---|---|
| Green Air Nitrogen Membrane (USD 1,500) | USD 1,500 | |
| Green Air Nitrogen Membrane (USD 800) | USD 800 |
Where each product stands
Because every published specification is the same, neither unit gains a performance edge. The higher-priced listing matches the lower-priced one on brand, condition, rating, and scope of what is included. The lower-priced listing matches the higher-priced one on those same points while asking less for the equipment. In a head-to-head, the only meaningful win is financial: the lower-priced listing puts the same described membrane into your setup with less money spent.
Product notes
Nitrogen Membrane Separator - USD 1,500
This listing describes the Green Air nitrogen membrane you would expect from the title: a used separator intended for nitrogen production in a high-demand draught beer system. It carries a 200 PSI rating, measures about 45 inches long by 6-8 inches wide, and weighs roughly 30 lbs. The concrete reason to consider it is that it exactly matches the other listing on every published detail, so you are not gaining any additional listed capability by paying more. The limitation is the price itself: you are choosing a higher listed price for the same described equipment. Also note that this is the membrane only; the compressor and tanks that originally accompanied the unit are not part of the listing. If you need a complete nitrogen generation setup, this listing requires sourcing those components separately.
Nitrogen Membrane Separator - USD 800
At the lower listed price, this listing offers the same used Green Air nitrogen membrane with the same 200 PSI rating and the same physical profile: about 45 inches long, 6-8 inches wide, and roughly 30 lbs. The concrete reason to choose it is straightforward: it delivers the same published details as the higher-priced listing while leaving more budget available. That is a meaningful advantage when the descriptions are otherwise tied. The limitation is that you are still buying a used membrane-only unit. The original installation's compressor and tanks are not included here, so your nitrogen system will need them from another source. For a shopper comparing two listings that describe the same product, this is the option that makes the cost decision easier.
Final choice by use case
If your filtration separation setup needs a used Green Air nitrogen membrane and you want to avoid spending extra, the USD 800 listing is the one to pick. The USD 1,500 listing describes the same membrane in the same used condition, so the additional spend does not change what you receive. Reserve the higher-priced listing for situations where you have a reason not tied to the listed details to pay more for the same equipment.
