Genuine Lister Petter oil filter element for the Petter AV2, AVA2, PH2, PH2W, PJ2 and also Lister HA2 & 3 as well as HR2 & HR3 engines.
Lister Petter part number 352-31720 which supersedes 250657
Approximate dimensions are 135mm long, 70mm OD and 33mm ID.