Customer Rating: 
Summary: Pop rivets hold the two halves together, on my blast gates...
Comment: Jet JW1007 4-Inch Blast Gate
These Woodstock International blast gates are identical to the ones I began using over 20 years ago. This same blast gate is sold by countless vendors; Jet is just one of many.
They are inexpensive and work acceptably, although they leak a little air when closed.
They have three parts, the two halves (glued together) with the movable gate in the middle. The two halves on all of my Woodstock gates eventually came unglued. Some lasted a couple of years, and one lasted at least a decade before separating. Rather than replace them, I repaired each gate using pop-rivets or 8-32 machine screws & nuts to hold the halves together. Except for this issue, none of my plastic blast gates ever "broke".
The gate's ABS plastic body is smooth and each male side is slightly tapered. Because of that taper, a clamped-on air hose tends to slip off, unless screws or other methods are used, to keep it attached. See Customer Images. It would have made sense to taper maybe the first 1/4" so it slides into a duct or hose, but tapering the entire male fitting end was not a great idea.
I have a blast gate for the table saw, sliding compound miter saw, planer, sander, band saw, jointer, and drill press. Unlike other reviewers though, none of my Woodstock blast gate has EVER filled up with dust or debris to the point that it stopped working or needed cleaning. Perhaps that's because the dust collector is a 3-hp 1800 cubic feet minute unit; and the air moves so fast, it doesn't have a chance to clog a blast gate? Also, the grooves in a blast gate are more likely to clog if the gate handle faces down.
I rate them at two stars, since a customer shouldn't have to repair a product to keep it working, and the tapered male ends allow hoses to slip off.
