tnx 
fixed it
Interesting but link fails
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thxs! ordered 2 sets
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Guys unless there is “something magical” added to these they are simply pneumatic silencer/mufflers used to dampen the PSsssssttttt from valves or cylinders in automation. This unit has a 1/4" interface which is just a standard pipe thread.
They are only a few cents each on Aliex or similar if you buy a bag
HTH
G
any link ?
The grey plastic domed units look like ones I used before, sourced locally here in Ireland from one of the mainstream pneumatic/mechatronic suppliers, I can’t recall the brand. The ones above are Chinese modelled/cloned on what looks like a Festo. Origianals from Festo will be good value from your local distributor and of known quality.
G
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they look similair that’s true… but is the filter inside is the same ? good find
what’s the expression ’ the proof is in the pudding ’ 
Looks like a low quality pin compatible knock off of the SenseAir S8 sensors.
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Am still looking for a low power way to handle CO2… These sensors take up to 60mA @ 5v, 150mA peak and require a 3min pre warm time so not ulp lora node friendly 
taking just 4 reads per hr needs big batt…or a wired low voltage feed.
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I use the SenseAir S8 sensors and they Are very low power and do not require a 3 minute warm up.
Good to know they dont have a pre-heat time, avg current @~25% looks good but still very assymetric wrt nodes sleeping @<25uA, what does worry is the potential peak current @300ma!!! 
Battery sag/fatigue would be very high and probably not sustainable on large coincell or small form factor/smaller capacity batteries…what I would like to see is sensor with <=1mA reading, no pre-heat/warm-up and absolute peak <20mA…
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