Podavelle AN8 to 1/4"-18 NPSM Adapter — Aluminum, Black Anodized, Pack of 2 for Popular Transmissions

Podavelle AN8 (3/4-16 UNF) male flare to 1/4"-18 NPSM transmission cooler adapter fittings, sold as a pack of two, provide a durable aluminum connection between braided cooler lines and transmission cases that use straight NPSM threads.

These compact adapters let you attach AN8 braided hose assemblies to transmission cases that accept 1/4" NPSM fittings without cutting or modifying the case threads. Machined from 6061-T6 aluminum and finished with anodizing, they are lightweight, corrosion-resistant, and supplied with sealing washers for a reliable seal. They’re intended as replacement or upgrade pieces for a wide range of automatic and manual transmissions.

Which transmissions and installations are these adapters compatible with?

They are designed to fit popular domestic and performance transmissions that use 1/4" NPSM style ports. Podavelle lists direct fitment for many common transmissions, but you should always verify thread type and clearance on your case before purchasing.

• Fits transmissions such as TH350, TH400, 700R4, 4L60E, 200-4R, TR6060, AOD, 4R100, 4R70W and C5 applications
• Intended for cases with straight 1/4"-18 NPSM female ports (not tapered pipe threads)
• Works with AN8 (3/4-16 UNF) male flare braided hose ends

How do these adapters prevent damage to transmission cases?

Unlike tapered pipe fittings that wedge into soft cast aluminum and can crack or distort the housing, these adapters use straight threads that engage without forcing the case. That design reduces stress on the port and helps preserve the original casting integrity over repeated installations or removals.

• Straight-thread style avoids the wedging action of tapered pipe threads
• Sealing washers provide a leak-resistant joint without over-torquing the case
• Removable and service-friendly for maintenance or hose changes

What materials and finish are used, and how do they hold up?

These adapters are CNC-machined from 6061-T6 aluminum, a standard material for strength, light weight, and ease of machining. An anodized surface finish improves corrosion resistance and wear characteristics while giving the fittings an engineered appearance.

• 6061-T6 aluminum construction for durable, lightweight performance
• Anodized coating for corrosion resistance and longer service life
• Supplied with sealing washers to ensure a reliable connection

Are these fittings compatible with different fluids and hose types?

Podavelle machined fittings are compatible with common automotive fuels and transmission fluids, and they work with standard AN style braided hoses and hose ends. Confirm chemical compatibility for specialized fluids before use.

• Compatible with gasoline and alcohol-based fuels as well as transmission fluids
• Designed for AN8 male flare hose ends and braided line assemblies
• Pack of two adapters for dual-line routing or spare installation

Who is this for: These adapters are best for automotive enthusiasts, performance builders, and professional mechanics who need a clean, reliable way to attach AN8 braided cooler lines to transmissions with straight 1/4" NPSM ports. They suit restoration projects, upgraded cooling systems, drag- and road-racing installations, and anyone replacing worn or damaged OEM fittings. Professional installation is recommended; the product ships without installation instructions.