The simple, safe and non-destructive way to test the tightness of overlap weld seams, using the Leister
VACUUM BOX. Soapy water is applied to the welding zone to be checked. After connection to the VACUUM
PUMP, a vacuum is generated above the zone with the VACUUM BOX/BELL. Thanks to its generous dimensions,
and the practical drain valve, even longer weld seams can be tested quickly and reliably.