• Why measure correctly?

    Getting accurate measurements saves time and ensures the pre-filter fits snugly and protects your engine. A quick measurement now prevents returns and guarantees the best performance.

  • Tools you’ll need

    Tape measure or ruler (inches), calipers (recommended for accuracy), a pen or phone to record dimensions, and a camera or phone to take a reference photo.

How to format your measurements?

Please send measurements in this order: Top Diameter" x "Base Diameter" x Height"

Example: 4.0"(top diameter) × 6.0"(base diameter) × 5.0"(height)

If you’re not confident, reach out to us for assistance.

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Round

A classic circular filter with the same diameter top-to-bottom.

What to measure:

  1. Top diameter (A): Measure across the widest point of the top opening (inside edge to inside edge if you want internal fit).
  2. Height (H): Measure from the base to the top edge (vertical).

Example: 3" × 2.5"

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Round Taper

A circular filter that narrows (or widens) from base to top.

What to measure:

  1. Top diameter (A): widest top opening at the rim.
  2. Height (H): vertical distance from bottom edge to top edge.
  3. Base diameter (B): diameter at the bottom where it sits on the intake flange.

Example: 2" × 3.5" × 5"

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Oval

An elongated rounded shape with parallel sides.

What to measure:

1. Top (Width x Length)

Top width (W): shortest diameter across the narrow side (inside edge to inside edge).
Top length (L): longest diameter across the long side.

2. Height (H): vertical height.

3. Base (Width x Length): measure base dimensions if they differ. If base matches top, note that.

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Oval Taper

An oval filter that changes in size between base and top.

What to measure

  1. Top width & length (W × L).
  2. Height (H).
  3. Base width & length (BW × BL).
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