Mitigating ice build up in a fluid handling assembly

A method of accommodating ice build-up from water trapped in a fluid handling assembly, the method comprising:

• disposing a membrane in a cavity of the assembly where water may become trapped due to use of the assembly;
• using the membrane to divide the cavity into a first sub-cavity on a first side of the membrane that is configured to collect any water trapped in the cavity and a second sub-cavity on a second, opposite side of the membrane;
• configuring the membrane to change shape such that the first sub-cavity increases in volume and the second sub-cavity decreases in volume in response to being subjected to water freezing conditions in order to accommodate an increase in volume of any water that may be trapped in the first sub-cavity when it freezes to ice.