Nibe VPA 300 User's And Installer's Manual page 18

Pipe connections
VPA 300/200
XL4
XL8
XL35
XL9
Designation
XL3 Connection, cold water
XL4 Connection, hot water
XL8 Connection, docking in
XL9 Connection, docking out
XL29 Connection T&P valve
XL35 Connection for immersion heater*
*can be used as an access to view the cylinder internally.
18 Chapter 4 | Technical data
XL29 XL3
Name Dimensions
Ø 28 mm
Ø 28 mm
G1½"
G1½"
Ø 15 mm
G2"
VPA 300/200