38mm header fits 3 liter plastic spray container/industrial disconnects - Agitating Spray Headers are designed with extended air tube. Agitates spray mixture during spraying or manually by releasing air through pop off safety. Air enters spray container at base and helps keep solids in suspension. To disconnect spray container between treatments, operator closes air valve and releases pressure through 60 psi pop-off safety (1202). Once container is depressurized, spray header can be removed from plastic spray container.