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AN921 O-Ring Boss Adapter - 90' Elbow

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These AN921-style adapters have a nut that allows you to clock the fitting in whatever direction you need. Simply screw in the fitting, aim it in the direction you need, and tighten down the nut to lock it in place. Each fitting includes the nut, the O-ring, and an aluminum sealing washer. Conforms to JIC and SAE specifications.

We also offer Straight 12AN O-ring Port to AN Adapter Kits in several sizes (Part No. 1280-Size) as well as 45 Degree O-Ring Bosses (Part No. 3279-Size).

Enter desired order quantities below, then click the "Add selected quantities to cart" button.

Order Qty
Part No.


7/8-14 O-Ring Boss, 10AN - 90' Elbow

1 to 5: $27.99

6 & up: $25.54

In Stock


1 1/16x12 O-Ring Boss, 12AN - 90' Elbow

1 to 4: $34.99

5 & up: $31.98

In Stock


9/16 x 18 O-Ring Boss, 6AN - 90' Elbow

1 to 5: $17.99

6 & up: $16.36

In Stock


3/4 x 16 O-Ring Boss, 8AN - 90' Elbow

1 to 5: $19.99

6 & up: $18.19

In Stock


by PowerReviews
AN921 O-Ring Boss Adapter - 90' Elbow

(based on 1 review)

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Reviewed by 1 customer

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Must have for tight spaces

By jkstill

from Portland, OR

Verified Buyer

Comments about AN921 O-Ring Boss Adapter - 90' Elbow:

I needed (wanted) after market fuel rails in my 1993 RX-7. It is an autox car and needs more power (don't we always), and more fuel required more modern fuel injectors.

The challenge is fitting new fuel rails and associated plumbing in what is a rather compact space. While there are other 90 degree boss adapters, they generally take up more space than these do.

Perhaps the most important benefit is that locking ring - these are the only boss adapters I could find that both fit and could be clocked in whatever direction was needed to fit the fuel line plumbing.

Service and delivery comments:

I have used other vendors. Pegasus is the *only* vendor that always has the parts in stock, and gets them shipped immediately.

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