It appears that
- NW is a VDA connector type specification for coolant connections
- 16 or 18 is the size portion of the standard dimension spec (so the connector is NW16 or NW18 size)
- 90 is probably the angle (a right-angle connector)
- PA66 and GF30 are a material specification - from a supplier web page:
- "PA66 (GF30 housing and retainer) stabilized against heat and hydrolysis effect for direct contact with coolant"
Do these connectors have female pipe threads in the other end? Then "FIP" would be "Female Iron Pipe", meaning inside threads of the NPT ("National Pipe - Tapered") type.
Knowing what the codes refer to might help in searching for connectors. There appear to be a few suppliers of NW16 and NW18 quick connectors, but I have no idea of a suitable source for small quantities.