Didn’t get to select L or R side when ordering.
Didn’t get to select L or R side when ordering.
The hose and fittings are nice quality. Their ability to get stuff shipped out quickly dose not happen.
It took a week to get my order to shipping.
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Lifetime Warranty on adapter fittings
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Metric Specialty fittings to an6 for GM OBS sending unit
$14.99
Reliable shipping
Flexible returns
M14 × 1.5 & M16 × 1.5 to AN-6 / AN-8 Female Adapters for GM Sending Units
Precision metric specialty adapters that convert GM/Chevy sending unit metric O-ring ports to AN-6 or AN-8 female for modern PTFE hose plumbing. Ideal for OBS and similar GM tanks that use a female metric port with a positive-seal O-ring nose.
Choose your adapter
- Thread size: M14 × 1.5 or M16 × 1.5 (metric straight thread, positive-seal O-ring)
- AN side: AN-6 female or AN-8 female (swivel)
Built to pair with our Spectra FG12-series sending units: FG12M · FG12L · FG12K.
- Direct conversion: metric O-ring port → AN female, no sketchy stack of adapters.
- Clean, serviceable connections: pair with PTFE AN hose ends for leak-resistant EFI plumbing.
- Swap-friendly: perfect for LS/LT EFI upgrades using GM sending units (FG12 series).
- CNC-machined & anodized: durable finish; use aluminum AN wrenches to prevent marring.
Specs
| Metric side | M14 × 1.5 or M16 × 1.5, straight thread, positive-seal O-ring nose (male) |
| AN side | AN-6 female or AN-8 female (swivel) |
| Primary use | Fuel sending units & modules (GM/OBS and similar) |
| Finish | Anodized aluminum |
Where these adapters shine
- FG12-series sending units → convert metric O-ring ports to AN for PTFE hose plumbing.
- EFI conversions & LS/LT swaps using GM tanks/modules.
- Filter/regulator service when standardizing to AN across the system.
Install tips:
- Confirm your sending unit’s port is female metric O-ring and verify size: M14×1.5 or M16×1.5 (use a pitch gauge).
- Lightly oil the O-ring. Thread the adapter in by hand to avoid cross-threading; tighten until the O-ring seats. Do not over-torque.
- On the AN side, use PTFE AN hose ends (choose AN-6 or AN-8 to match).
- Pressure-test after assembly. For EFI systems, run a 10 micron or finer (≤10 μm) pressure-side filter.
Important: For fuel system use. Not for brake or power steering circuits.
Recommended add-ons
- FG12-series EFI sending units (GM 73–87 Blazer/Suburban) · FG12M / FG12L / FG12K
- Extra PTFE AN hose ends (select AN-6 or AN-8)
- AN hose install tools (aluminum AN wrench & vice jaws)
- EFI fuel filters (≤10 μm)
- Gauge / pressure port AN adapter
- Hardline tube → AN adapters
Lifetime Warranty on adapter fittings
Fast Shipping • Free $99+
Expert Support
Quick FAQs
Will this fit my FG12 sending unit?
Yes—these are designed for GM metric O-ring ports found on FG12-series units. Verify your port size: M14×1.5 or M16×1.5.
AN-6 or AN-8—what should I choose?
AN-6 suits most EFI feed/return setups. Use AN-8 where higher flow is needed. Keep AN size consistent with the rest of your system.
Does the adapter include an O-ring?
Use a fresh, fuel-compatible O-ring sized for the metric port groove. Inspect and replace any worn O-rings during service.
Warranty
Adapter fittings are covered by our lifetime warranty against manufacturing defects.
Shipping
Fast shipping. Free shipping on orders $99+. Rates and options shown at checkout.
Returns
Hassle-free returns on new, unused items in original packaging per our Returns Policy.
Quality
CNC-machined metric-to-AN adapters designed to pair with PTFE AN hose ends for leak-resistant EFI performance.