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The VAULT Hybrid Oil Cap is a replacement bearing protector cap for UFP Trailer Buddy axles that run the Vault HLS hybrid lubrication system. It is a 1.980-inch cap, typically paired with 5-lug trailer hubs, and it seals the hub so the hybrid oil/grease bath stays in and water stays out. It is a single-purpose service part rather than an upgrade: buyers choose it to restore a Vault-equipped axle, not to convert a conventional grease hub. Owners rate it highly, and the main caution is that UFP specifies it as one-time use, so it should be replaced rather than reused when the hub is serviced.
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Lowest price we've seen: $68.99 on Nov 13 at Amazon. Tracked across 1 store since Nov 13.
Buyers rate the cap very highly and describe it as the correct replacement for their Vault-equipped trailer hubs. Complaints are limited, mostly around the one-time-use restriction and the need to match the size exactly.
This is a replacement Vault oil cap for UFP Trailer Buddy axles that use the Vault HLS (Hybrid Lubrication System).
It is typically used with 5-lug trailer hubs. UFP states that the cap is for one-time use only.