8mm inside diameter.
Just as a side note: La Marzocco, Rancilio, Nuova Simonelli and Wega (stainless steel) all more commonly use a 10 mm version, such as CVA5089 or W5089_10.
Cross-references:
Part number |
Manufacturer |
W.5089 |
ASCASO |
4005040 |
BFC |
86.00039 |
CARIMALI |
10493 |
ESPRESSO RESOURCE |
70000035 |
EXPOBAR |
A1600122 |
FIORENZATO C.S. |
1110100148 |
GRIMAC |
A1600122 |
GRIMAC |
GR130 |
GRIMAC |
L171/G |
MARZOCCO (really old GS 2 wands only) |
634278 |
NUOVA RICAMBI |
GR130 |
RICAMBI GARDOSI |
4005040 |
ROYAL |
10753050 |
SANREMO |
08256 |
SPAZIALE |
GOMMALANCIAVA |
VIBIEMME |