The Barbed 1" Male Hose Thread Adaptor is optionally used during the installation and maintenance of the laundry to landscape greywater system. It can be put installed just before a 1" Female Host Thread adaptor to insert a 'service connection' to a laundry system. From this connection, you can connect a garden hose to the outdoor portion of the system for calibration, testing, or clog clearing.
A service connection is not compatible with California Greywater guidelines, because it introduces the theoretical possibility of back-flow of greywater into the plumbing. A back-flow preventer would be required in CA to make this part of the permanent installation.