These depressors fit behind and protrude through the hose gasket on 1/4" flare and 1/2 ACME standard fittings. If you are replacing hose gaskets it's a good idea to replace these as well as they become smashed over time resulting in poor depression on the schreader fitting causing low flow.
Warning: This product may expose you to chemicals including lead which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov