It is for a John Deere lawn tractor. It uses a mower deck, disc, spreader, and wagon. I am sure the engine is actually made by Briggs and Stratton, 19.5 HP.
I did not know that Purolator does not make all of their filters but there are, according to the engineer I talked with, two or three outside sources.
Looking inside this thing you can see a very heavy duty pressure relief valve with coil springs. The metal core is spiral wound with corrugations. There are slits in each end of the corrugations. I can't see or feel them but my wife, fingernails, says she can feel them and she says she can see them also.
The engineer(heavy India accent) said I could use a PL10241 if I had enough room and it cost less. I don't have enough room and he said this was actually a better filter so I will go with it. I am going to use Amsoil small engine oil and change oil and filter at 25 hours as per manual. Should last a while.