English: The photograph shows a flexible braided filling loop (silver colour) used to add water to a sealed central heating system in the UK. The loop incorporates two valves (black handles); the left hand valve incorporates a one-way valve ensuring that water cannot pass from the sealed system back into the domestic mains water supply.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.