The brass connector is a component of the water meter connector (2 nuts, 2 tails, 2 washers).
The main material is brass, and washers use food-grade rubber, which is safe and efficient.
DN15mm - 1/2"
DN20mm - 3/4"
DN25mm - 1"
DN32mm - 1"1/4
DN40mm - 1"1/2
DN50mm - 2"