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Re: Buy one for under $10 and try it Posted by Viggener [Email] (#2101) [Profile/Gallery] (more from Viggener) on Thu, 21 Mar 2019 10:30:28 In Reply to: Re: Buy one for under $10 and try it, august_month, Thu, 21 Mar 2019 08:55:08 Members do not see ads below this line. - Help Keep This Site Online - Signup |
They do exactly that - they check air flow, allowing it to go in only one direction. An "air diode."
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