POWERTEC 70135V 4" Blast Gate for Dust Collector, Dust Collection Fittings

I ordered this blast gate knowing it was listed as aluminum, but honestly, I wasn't expecting it to be this heavy-duty. Usually, when you order metal fittings online, you expect something lightweight or thin. ​When I opened the box, I was genuinely shocked by the weight of it. This isn't just a standard metal piece; it is solid, thick, and feels industrial. Most importantly, the seal is incredibly tight. In my shop, I'm not just worried about sawdust; I need to know that fumes and carbon aren't leaking back through the system. This gate closes off completely, giving me peace of mind that nothing is passing through when it shouldn't. It operates smoothly, seals perfectly, and is a massive upgrade in quality compared to what I thought I was getting..

These unions are very good quality and easy to install

Worked great to connect two solid connectors. Right size, feel very sturdy. Thick heavyweight rubber.

After upgrading dust collection from a 2 1/2" shop vac to a proper dust collection system, I bought these aluminum blast gates and they work great. No suction loss, easy to install, and most importantly, no more clogged gates! For those saying that they leak like a sieve....they do not. The issue most likely is that the user installed them backward. With the direction of air flow being toward the dust collector, the knob to lock the blast gate down should be facing opposite the dust collector (meaning the side with the locking knob needs to be facing away from the collector and toward the machine/tool in reference to air flow). The reason for this is that when the knob is screwed down, it pushes the gate toward the housing creating a seal on the side opposite of the knob. If this installation is reversed, then there will be an air gap, which will cause suction loss. This is not a design flaw, rather, it is very purposeful in order to get great suction without having to use a gasket which would make the operation of closing/opening the gate a pain.

I had constructed my dust collector system with plastic blast gates and I have to say that they clogged almost immediately. Sawdust gets trapped where the gate slides down and the gate can't close properly. That doesn't happen with these metal gates. They work beautifully.

What the pictures don't show, in fact show incorrectly, is when the gate is closed, the bottom of the gate sticks out the bottom side. This means it cannot be mounted on a wall with the gate facing out, nor can it sit on the floor with the gate facing up. The third picture in the description shows the gate being closed with nothing sticking out of the bottom. It still works just fine, just not what it was advertised to be.

Work great

Great clamps. Heavy duty for vacuum system. Internal bore does not have a stop ridge indicating halfway.