Here is an affordable vacuum valve with a 1/4" NPT male thread and a 3/8" barb. You find it is very handy for custom vacuum manifolds and more.
This valve has a closed-open-closed handle configuration with a 180 degree swing.
WARNING: This product can expose you to chemicals, including lead, which are known to the state of California to cause cancer and birth defects or other reproductive harm. For more information visit www.P65Warnings.ca.gov.
By ordering this product, you acknowledge that it will not be used for installation in a system that is intended to convey or dispense water for human consumption through drinking or cooking.
Review by Doug Walls
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Seems well made and it's not large and bulky like some others I've seen. I haven't installed it yet, but the smaller size should fit good with my planned system.
Review by Teddy Jones
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I found this fitting to work very well on my vacuum pres and I had no issues at all installing it. It appears to be well made. Shipping was affordable and fairy quick.
Review by Dale Arnett
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Very good product, with a good price. Fast a friendly service. They let me know as soon as the unit shipped and had FedEx keep me up to date on when it would arrive.