•All Neltex fittings follow ASTM D3311 prescribed shape and size for best flow efficiency.
•There's a science for hydraulics and flow efficiency serving as a guide for plumbing design, so ASTM D3311 standards set specific parameters on the shape and size of fittings for plumbing.
•Following what was prescribed by the standards ensures that the system will not suffer from clogging, leaks, and untoward odors even after decades of use.
•But because they're not required in the philippine mandatory standards, only Neltex strictly complies with them and thus making a NELTEX-ALL plumbing system the flow-efficiency advantage over others.