The TPHD Hub Oiler Cap With Side Fill S/A 343 is a practical and efficient solution for your hub oiling needs. With 6 mounting holes and a bolt circle of 4 - 1/2 inches, this cap ensures a secure and reliable fit. It does not include a gasket, but its durable construction guarantees long-lasting performance. Trust the TPHD Hub Oiler Cap for its convenience and functionality, ensuring smooth operations for your equipment.