Lister domestic water pump 1/4" BSP brass repair plug pair. Hot brass stamped plugs with machined threads, these are superb quality British made plugs for the repair of pumps with stripped threads.
If your pumps casting has stripped the original 1/8" BSP threads these 1/4" BSP plugs can be used to execute a suitable repair. You will need to drill out the existing holes and re-tap them to the larger thread size, this can be a tricky operation as a portion of the hole is often off centre with the main casting so it is best done in a milling machine so as to avoid an oval hole by the drill being forced to one side. We can offer this machining process as a service if you are struggling, please get in touch.