38 mm to 50 mm: which adapter fits?
There is no such thing as the 38-to-50 adapter. The nominal size is a number, not a coupling — every manufacturer has its own transition, and a part from one does not fit another. This page states, manufacturer by manufacturer, what is documented and from what.
Steinbach
Steinbach Ø 38 mm → Steinbach Ø 50 mm-
- Hose adapter Ø 50 / 38 mm (049225) connects Steinbach Ø 38 mm to Steinbach Ø 50 mm (no source documents which way round it is fitted)
Derived from manufacturer data
47 recorded versions have the connection Steinbach Ø 38 mm.
Not documented
For these manufacturers the transition from 38 mm to 50 mm is not documented in any recorded source. That does not mean there is no part — it means we cannot show one and therefore recommend none.
- Gre — Gre Ø 38 mm → Gre Ø 50 mm, 10 recorded versions with this connection
The other way round: 50 mm to 38 mm — a question of its own, because an adapter is not necessarily documented in both directions.