Castagra Products, a storage tank and wastewater coatings manufacturing company that is highly acclaimed for its sustainable coatings and cold weather coating applications. Castagra products are NSF-61 certified and are used by the world’s top water and wastewater contractors.

In the Castagra Products blog post "20 Creative Manhole Covers," Mr Nakagawa, VP of Marketing and co-founder of Castagra Products, presents different creative explorations of the manhole cover design.