This Bearing Protector Cap (2.126" - 16), with spring loaded piston, is used on our 5-Lug Hubs. It is designed to be screwed into place with a strap wrench using Red RTV Sealant. Does not come with a Bra. Sold each.
Note: Apply grease into the grease zirk, using a hand style grease-gun. The lubricant level is checked by just being able to rock the edge of the spring loaded piston or until the piston has moved outward about 1/8”. This slight pressure assists with keeping the water out. Do not overfill, as this will cause damage to the Bearing Protector or the rear seal.