The HPS AN Male to Male Union Adapter (Reducer) Fitting [Straight] [AN -4 to -3] (Aluminum, Black) is in stock at PartSmith Co. and ready for dispatch from our USA warehouse.
![HPS AN Male to Male Union Adapter (Reducer) Fitting [Straight] [AN -4 to -3] (Aluminum, Black)](https://partsmithco.com/wp-content/uploads/2026/07/AN919_1_53508f7d-4d68-4eff-981d-9ba8c6d51bb7.jpg)
Petroleum contact requires the correct lining, so fuel and oil routing needs the right specification. Replace both the upper and lower runs while the system is open.
Details that matter
- Material: Aluminum
- Finish: Black
- Category: AN Fitting Components
- Price: $16.01 with free shipping over $99
- Availability: in stock, dispatched from the USA
Shops ordering in volume can send a full parts list and we will verify the whole job in one reply.
Keep shopping: Hoses & Fittings · HPS AN Male to Male Union Adapter AN Fitting [Straight] [-8] (Aluminum, Black) · HPS AN Male to Male Union Adapter AN Fitting [Straight] [-6] (Aluminum, Black) · full catalog
Finished surfaces are wrapped and hardware is bagged, so the part arrives ready to install.
For neutral background on this kind of maintenance, see the fuel economy maintenance guidance.
Buyer questions
How do I confirm this fits?
The application text on this page lists what the part serves. If your vehicle is not clearly covered, send the VIN and we will rule on it before you pay.
How fast does this ship?
Orders placed before early afternoon on a business day usually leave our USA warehouse the same day, and tracking is emailed when the label is created.
What is the return policy?
Contact support before removing or returning anything, so the right process starts on the first message and nothing is voided by accident.
How do you protect it in transit?
We verify diameter and reinforcement specification on every hose order.
![HPS AN Male to Metric Adapter Fitting [Straight] [-6 to M18 x 1.5] (Aluminum, Black)](https://partsmithco.com/wp-content/uploads/2026/07/AN816-06-X_pic1_1_f414e18f-37ad-4910-8abb-c7f9ac2080bf-300x300.jpg)
![HPS AN Male to Metric Adapter Fitting [Straight] [-6 to M16 x 1.5] (Aluminum, Black)](https://partsmithco.com/wp-content/uploads/2026/07/AN816-06-X_pic1_1_b0b8871f-2b21-4f3d-9270-e611d31355a7-300x300.jpg)
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