Welch
S3421-99
Trestle
Manufacturer’s part number
Where to get it
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As printed in the source
15 | Trestle | 1 | S3421-99
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.
In the manufacturer’s drawings
- Position 15 · 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.