Why would I choose this stem instead of the flush-mount stem?
Since this stem is removable it is ideal for use with temporary or limited-use vacuum bags made from disposable material.

Why would I choose the flush-mount stem instead of this stem?
The flush mount stem, which is included with all of our vacuum bags, does not protrude and impress itself against the surface of the project being vacuum bagged. This means that the flush-mount stem can be set directly on top of the veneered project without marring the surface.

What makes this stem better than the flush-mount stem?
This stem is removable so it can be moved from bag to bag if you want.

What is the size of the large washers on this stem?
The diameter of the grommets is approximately 1.5"

What is the size of the lower portion of the stem shaft?
The lower threaded area is approximately .4" in diameter?

What is the thread size on the top of the fitting?
It is a standard Schrader thread which is .305" OD and 32 tpi.

Does this fitting work with the new version of the lock-on connector?
This fitting only works with the old version.

Does this stem have a valve inside?
No. Valves are a flow restrictor and since the vacuum source must stay attached to the bag during a pressing cycle, there is no point of having a valve inside the stem.

What thread size is on the back side of the lock-on connector?
1/4" NPT

Why does the vacuum bag have to stay connected to the vacuum press after full vacuum is achieved?
Yes, because a perfect seal on a vacuum bag is virtually impossible. Here are some things to consider.

• Sometimes the bag closure doesn't seat perfectly across the opening.
• Sometimes the bag stretch a bit after full vacuum is created and will then need a bit of additional vacuum. This happens most often when there is a large project in the bag. You'll hear the vacuum system cycle off (if you have any auto-cycling system) and then turn on again for a few seconds. After that, it may not cycle again for several minutes or even hours.
• After many uses some bags develop pin holes which can be almost invisible. In those cases, it's best to let the vacuum press keep the bag vacuum under control.

If the vacuum system is disconnected from the bag, you won't know if there is a leak because there is no vacuum gauge on the bag itself. If the bag is connected to a vacuum press system, you can easily see the vacuum level by looking at the gauge on the vacuum press. The vacuum inside the system is the same amount of vacuum inside the bag. If your vacuum press cycles on and off too frequently during a project pressing, you'll know there is a leak and if you can fix it. However if you can't fix the leak, at least the vacuum system will keep manage the vacuum in the bag until the panel is finished.