The HPS AN Male to Male Union Adapter (Reducer) Fitting [Straight] [AN -4 to -3] (Aluminum, Black) sits in the Hoses & Fittings department here, stocked and fitment checked.
![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-9ba8c6d51bb7-3.jpg)
Clamp choice matters: constant tension or lined clamps protect the hose surface over heat cycles. Route clear of heat sources and moving components.
Part details
- Material: Aluminum
- Finish: Black
- Category: AN Fitting Components
- Price: $16.01 with free shipping over $99
- Availability: in stock, dispatched from the USA
When two options look similar, our parts team will tell you which one your vehicle actually takes.
Customers also open: 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
We pack for the worst day the carrier can have, which keeps our damage rate low.
Further reading from a neutral source: the NHTSA vehicle safety hub.
Buyer questions
Is fitment guaranteed on this listing?
We verify every doubtful order by hand. Give us the year, make, model and engine option and we will confirm compatibility in one reply.
How long does delivery take?
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?
Returns are handled in one reply for most cases. Keep your order confirmation, since it is the only proof of purchase we need.
How do you verify this part?
Lines and fittings are checked for pressure rating, inner diameter and ply count before shipping.
![HPS AN Male to Metric Adapter Fitting [Straight] [-8 to M14 x 1.25] (Aluminum, Black)](https://partsmithco.com/wp-content/uploads/2026/07/AN816-06-X_pic1_1_2d43096e-0176-48a6-aafa-d4ad5b2e739f-300x300.jpg)
![HPS AN Male to Metric Adapter Fitting [Straight] [-6 to M20 x 1.5] (Aluminum, Black)](https://partsmithco.com/wp-content/uploads/2026/07/AN816-06-X_pic1_1_9ea8f01c-f6ee-43ae-9912-654e10e73c03-300x300.jpg)
![HPS AN Male to Metric Adapter Fitting [Straight] [-6 to M22 x 1.5] (Aluminum, Black)](https://partsmithco.com/wp-content/uploads/2026/07/AN816-06-X_pic1_1_84a0bab4-582d-4dc1-a176-6237879f811f-300x300.jpg)
![HPS NPT Allen Plug Fitting [3/8 NPT] (Aluminum, Black)](https://partsmithco.com/wp-content/uploads/2026/07/AN932_1_6be249de-b49f-4373-8667-06e8edb296af-300x300.jpg)
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