Although we have tested the TR version of the BFM® Seeflex fittings under vacuum to over 0.8 bar vacuum, we would not recommend a Seeflex connector for that much pressure (refer to the ‘BFM® Limitations: Negative Pressure’ document). However, depending on the length of the connector and the type of vacuum (i.e. will it be gradual increases, is it continuous, is it sudden and/or occasional) it may be possible with the insertion of rings in the connector. The length is the most critical element as greater lengths will cause the walls to suck in further, potentially placing them in the product flow increasing likely abrasion. If having a non-transparent connector is an option, the LM4 connector is a good option. Because it is a woven fabric, the LM4 will suck in outside air which is filtered through the material.