and the other is 1-1/2" outside diameter

The inspection cap tool is the perfect size and radius to install and remove your inspection caps without chewing them up

- Triumph Trident 3-cylinder

These are also a perfect fit for the JRC Carburetors

Slotted Inspection Cap / Plug for Triumph BSA OEM #57-2166 70-8231 40-0715 Subcategory_Aluminum Bungs and the other is 1-1/2"These billet aluminum slotted inspection caps fit Triumph and BSA motorcycles. They fit your primary inspection hole, gearbox filler hole and also the kicker cover inspection hole. Complete with O ring seal. These stay true to your stock style covers and are made right here in Ohio, USA! Replacement for Triumph OEM # 57 2166, 70 8231, 40 0715