1.our fire hydrant hose adapter is made of heavy-duty brass, brass garden hose adapter fittings are more heat-resistant, corrosion resistance than aluminum fire hose and hydrant adapters2.Female Size--- 2 1/2 " NH / NST(National Standard Thread),the brass fire hydrant adapter for attaching to the fire hydrant3.Male Size---3/4” Male garden hose thread (GHT), the fire hydrant to garden hose adapter for connecting to a hose,the male only connects to a female 3/4” GHT4.Built a water tank: The fire hydrant adapter fittings connects to fire hydrant to hose adapter provide high volumn water output for watering garden and orchard, washing car,firefighters firefighting applications5.Multi-use Hose to Hydrant: the brass fire hose and hydrant adapter f.