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Metric Specialty fittings to an6 for GM OBS sending unit
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  • Metric Specialty fittings to an6 for GM OBS sending unit
  • Metric Specialty fittings to an6 for GM OBS sending unit
Metric Specialty fittings to an6 for GM OBS sending unit

Metric Specialty fittings to an6 for GM OBS sending unit

$14.99 USD
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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:
  1. 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).
  2. 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.
  3. On the AN side, use PTFE AN hose ends (choose AN-6 or AN-8 to match).
  4. 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.

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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.

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