These fittings are built to provide strong and dependable connections for many piping techniques and to face up to the rigors of demanding environments. The black malleable iron fittings are ideal for gas and oil applications, though the galvanized iron fittings are ideal for non-potable drinking water and outdoor use https://malleableironfittings05937.blazingblog.com/38549759/detailed-notes-on-features-of-malleable-iron-pipe-fittings