1/4" BSP, 140 mm, does not include a BF_82 fiber gasket.
Some probes are bent prior to installing into the side of the boiler, so be sure to keep your old one so you can match the shape of your new one to it. It is a simple, solid length of stainless steel, and bending it will in no way affect it's functionality.
Attention CA Residents: Prop 65 Warning
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.