FRAM PH4703 vs NAPA Gold 1626: Oil Filter Compatibility
Compare FRAM PH4703 and NAPA Gold 1626 oil filters by compatibility, dimensions, thread size, gasket fit, bypass valve, anti-drainback valve status, and match confidence. Use this comparison as a fitment review, not as an automatic substitution guarantee. Both use a M20x1.5 thread.
Quick verdict
Closest known dimensional difference: height -7.8 mm. Verify application-specific requirements before substituting.
- Thread size is the first hard-fit check for any comparison of spin-on filters.
- Gasket OD and gasket ID are the most important seal-related dimensions.
- Height differences can matter for clearance even when thread and gasket fit appear close.
- Bypass and anti-drainback differences may be important, depending on the application.
FRAM PH4703 and NAPA Gold 1626 specifications
How matching is scored| Specification | FRAM PH4703 | NAPA Gold 1626 |
|---|---|---|
| Thread size | M20X1,5 | M20x1.5 |
| Gasket OD | 71.1 mm | 72 mm |
| Gasket ID | 62.5 mm | 63 mm |
| Can OD | 86 mm | 93.04 mm |
| Height | 89 mm | 96.82 mm |
| Internal bypass valve | Yes | Yes |
| Bypass PSID | 12 | 8 - 11 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are M20x1.5.
Gasket OD differs by 0.9 mm (FRAM PH4703: 71.1 mm, NAPA Gold 1626: 72 mm).
Gasket ID differs by 0.5 mm (FRAM PH4703: 62.5 mm, NAPA Gold 1626: 63 mm).
NAPA Gold 1626 is 7.8 mm taller (FRAM PH4703: 89 mm, NAPA Gold 1626: 96.82 mm) -- check clearance before substituting.
Can OD differs by 7 mm (FRAM PH4703: 86 mm, NAPA Gold 1626: 93.04 mm).
Both open their bypass valve in a comparable range: FRAM PH4703 at 12-12 psi, NAPA Gold 1626 at 8-11 psi -- these ranges do not overlap.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.