[PublicLab] How a Compression Coupling Works (#24232)

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Public Lab contributor kgradow1 just posted a new research note entitled 'How a Compression Coupling Works':

Read and respond to the post here: https://publiclab.org/notes/kgradow1/07-29-2020/how-a-compression-coupling-works

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Purpose

The bucket monitor uses a compression coupling to attach the Tedlar bag and the vacuum hose. Compression couplings are often used in plumbing fixtures to get a watertight seal. We're going to look at the stainless steel intake port, which is a 3/16" stainless steel bulkhead.

Intake Port: Nut and Ferrule

The intake port is located on the top of the bucket. It is typically capped until you are ready to take a sample.

What it looks like on the inside

The bottom side of the port attaches directly to the 3/16" valve on the Tedlar bag.

Tighten the Bulkhead

When you're ready to attach it use two adjustable wrenches to tighten down the bulkhead. This will crush the ferrule and nut into the tube, biting into the plastic and creating a firm connection. This connection is airtight.

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