366-07039 Swivel union plug commonly used with the T series engines. This adapter was used with accessory kits LG and LF in the TS and TR line of engines.
This will be item number 1 in the Lister Petter drawing.
Make sure you order 2 copper sealing washers when replacing the adapter, part number for the washers will be 616-01608
Warning; Do not over tighten this adapter as you will twist it off inside the engine block, this is a very common mistake when trying to fix oil leaks. There will be no returns or refunds when this happens and it's a very obvious mistake.
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