Use to attach .580 mainline drip tubing, or soaker hose to a hose bibb, spigot, hydrant, faucet, end of a garden hose, filter, pressure regulator, etc. The swivel end screws onto male hose threads. The compression end accepts hose with a .580 outside diameter.
Using the #109 Female adapter and screwing it on to your tee, coupling, elbow or in-line valve and then using the compression end of the #109 for poly tubing, it allows you to easily disassemble your system.
Instead of just using the compression end to attach your tubing, as shown.