... fitting range: Coupling -- Equal coupling, Reducing coupling, Adjustable coupling, coupling with screw; Elbow -- equal elbow, reducing elbow, elbow with plain end, elbow with screw; Tee ... countries, Asia countries and some other countries. Standard:Press fitting standard: GB/T 19228.1-2003, DVGW W534 ... DIN EN 10312:1999 and JIS G3448-1997Sealing ring standard: GBT 19228.3-2003, EN681-1:1998 Technical ...