5mm and 6mm brass adapters. Suitable for permanent connection to the inlets when used with a thread sealant. Includes nitrile sealing washers for temporary connection. If using as a permanent connection do not use the nitrile o-rings but but a suitable thread locking sealant. End Caps. Available as an extra option are high temperature end caps for adapters. Click the drop down box to add them. 4 end caps for £3 when bought with the adapters.