Breathing assistance apparatus and/or components thereof

A breathing assistance apparatus comprising:

• a housing comprising an engagement feature;
• an electrical component in the housing, the electrical component comprising a receptacle;
• a removable component comprising an electrical connector that is configured to be a close or tight fit in the receptacle of the electrical component to assist with holding the removable component in connection with the electrical component, the removable component comprising a gas port, wherein the removable component further comprises a tab with a terminal end portion that can be flexed relative to the rest of the removable component, wherein an engagement feature is provided on the terminal end portion of the tab and is configured to engage with the engagement feature of the housing such that the removable component is inhibited from disconnecting from the housing in the absence of actuating the terminal end portion of the removable component to flex the tab.