I received this info. in an email from Hercules the other day. I thought this would be an interesting offer for anyone resealing John Deere Hydraulic cylinders. https://herculesus.com/product.php?...nzWJwFcBta-XH8O8Ucc6pglPk0UjR6K5ZPz-tA6KKC0ck
The john deere rebuild kits usually come with one in the bag, but you better save it for the next time.
That is true. But not everyone buys OEM John Deere kits. I have read on here that the ring can be damaged when using them. Hercules must / may not include the rings in their kits. I would guess that is why they offer the kit.
Yeah sometimes in a pinch I have to get whatever seals I can then I hope I have a ring laying around in the junk drawer.