The gas pipework can be separated in to 2 categories. The first would be the pipework that is external to the appliance and is connected to the wall jig which allows an influx of gas.
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Technical Specifications
TypeAdapterSupplier Part NumberUUBTPA04KBrand NameClesse
Reviews
929312
Clesse UUBTPA04K Lpg 1/2inMALE x 1/2inFEMALE Test Point Adapter