User provided screenshot of RNT Smart Clamp MJG80A (with SUS304
material, NBR seal, 89.1mm pipe OD, 67.8-91.9mm range) as the
canonical hero image for this product.
Changes:
- public/images/pipe-coupling/mjg80a-hero.png: new hero image
(copied from user's Desktop screenshot)
- pipe-coupling.astro: hero <img src> updated to mjg80a-hero.png
- all-products.astro: card image updated to mjg80a-hero.png
Other 5 model images (mjg/mjh/mjd/mjer/mjcx/rnt-e009) unchanged
as those are individual model photos from ranotech.com.
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