R-Kits are standard and offer a high-quality lube cycle of 8 hours which is acceptable for many applications. R-kits and E-kits are interchangeable for all available Weasler series as well as with standard cross and bearing sets in the market. This means that a Weasler PTO drive shaft with R-kits can still be upgraded to E-kits or M-kits. Lubrication cycle of up to 8 hours. A black seal with grease fitting makes it fast and easy to find a P-Kit.