Welch · Oil / lubricant
S3478-99
Oil window
Where to get it
No supplier lists this number with us yet. Ask for a quote and a specialist finds price and availability for you.
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As printed in the source
100 | Oil window | 1 | S3478-99
Fits 1 model
As listed by WelchWhen ordering, give the model and serial number from the nameplate: some parts changed within a model’s life.
Where it sits
In the CRVpro 48
10 · Oil
- ADT40 fine vacuum adsorption trap. With a very high affinity to Hydrocarbons to eliminate oil back-streaming705185
- Labovac 13, PFPE oil, 1 liter800131-01
- Premium vacuum pump oil, 5 liter800995-05
- Premium vacuum pump oil, 20 liters800995-20
- Premium vacuum pump oil, 200 liters800995-200
- Oil Fill PlugS3056-99
- Oil casingS3473-99
- Oil windowS3478-99
Our drawing of the machine type, with the CRVpro 48's own parts; this part is highlighted. Side view along the shaft. Oil-free (dry) pumps have no exhaust box oil, sight glass or oil filter; their exhaust filter is a dust filter.
In the manufacturer’s drawings
- Position 100 · Exploded viewmanual crvpro 48 65 gm 6 16 2020, p. 40
Part number, name and fitment as published by Welch (source), retrieved 2026-10-19. Vac & Air is independent and not affiliated with the manufacturers shown; names and numbers identify the parts only.