Order the HPS AN Male to Male Union Adapter (Reducer) Fitting [Straight] [AN -4 to -3] (Aluminum, Black) from a parts team that verifies fitment before anything leaves the building.
![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-9ba8c6d51bb7-2.jpg)
Clamp choice matters: constant tension or lined clamps protect the hose surface over heat cycles. Keep petroleum away from standard silicone unless the hose is lined for it.
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
Message us the vehicle details and we will confirm compatibility, including anything unusual about your build.
Customers also open: Hoses & Fittings · HPS AN Male to Male Union Adapter AN Fitting [Straight] [-6] (Aluminum, Black) · HPS AN Male to Male Union Adapter AN Fitting [Straight] [-4] (Aluminum, Black) · full catalog
Orders placed before early afternoon usually leave our USA warehouse the same business day, with tracking emailed at label creation.
General guidance on this system is published in the fuel economy maintenance guidance.
Buyer questions
Will this part fit my vehicle?
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.
When will my order dispatch?
Most orders dispatch within one business day. You receive tracking by email the moment the parcel is handed to the carrier.
Is there a warranty on this?
Report any transit damage with a photo and we will send a replacement or refund you. We handle the carrier claim ourselves.
What quality checks does this get?
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 NPT Adapter Fitting [Straight] [-8 to 1/2 NPT] (Aluminum, Black)](https://partsmithco.com/wp-content/uploads/2026/07/AN816-06-X_pic1_1_b76d947d-1e43-4e38-b986-a8f6682cdca6-300x300.jpg)
![HPS NPT Allen Plug Fitting [1/8 NPT] (Aluminum, Black)](https://partsmithco.com/wp-content/uploads/2026/07/AN932_1_11e3bb56-b4df-4954-84cd-0d354b2dd8ff-300x300.jpg)
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