eVac Duo 800

The VAST eVac Duo 800 with all the Accessories

Vendor: VAST

2½ months ago I reviewed the updated eVac 2.0 from VAST. While it was a big improvement ergonomics wise to the five year old previous model, being a monopole needing a second pole to work for e-stim made it hard to handle in some situations. A couple of weeks ago VAST also released an update to the old duo-pole eVac. In this review I will look at the differences between the toys and how this toy works. So I recommend you read at least the construction section of the eVac 2.0 review before reading this one.

Construction

The eVac Duo 800 has the same basic design like the eVac 2.0, has the same 220mm length and is 3D printed out of the same polymer. As the name indicates, it is considerably larger at 80mm internal diameter. Inside are now two stainless steel rods. One sound like with domed attachment, one with a flat segment plate which sits in the top half of the cylinder in order to press against the pelvic area. Theoretically you could change the position of the two but that does not make sense for ergonomic reasons.

The Nuts holding the Two Rod Electrodes in Place

The nuts holding both rods in place are sitting next to each other on top. Because they are so close to each other, the nuts don’t have wings anymore for tightening but just small studs for better grip. In order to tighten the screws tight enough for a vacuum seal, a winged tool is included will grips the studs and thus allows for more torque.

Having two rods, the eVac Duo comes with two plugs to seal the cylinder when you are not using both or any of the rods. The hex key from the eVac 2.0 has been replaced with a small screw driver which is also now the standard for all eVacs. To ensure the longevity of the toy, a small tub of Wondergrease silicone grease is included. All the accessories come in a small drawstring bag to keep all the accessories together.

The Plate Electrode as a Counterpole for the Sounding Electrode

Playing with the eVac Duo 800

Since the eVac Duo has the same ergonomically shaped base, it has the same great and quick vacuum seal. Having a larger diameter and thus more volume, the Duo behaves a bit different. It takes longer for the vacuum to take effect because air needs to be evacuated. Because of this the vacuum comes a bit softer and can be more gradually increased. But it also means, you need to pump more. If you or your bottom are petit or skinny, ensuring contact between the skin and the cylinder feet is a bit of a challenge, especially when he starts moving his legs. Due to the larger footprint, the cylinder has a considerably larger leverage.

The Duo addressed the issue that the sounding electrode needs a counter pole in order to create a close electric circle. This electrode could either be a pad electrode which due to the lower mass could be ending up the spot where the sensation is felt or an anal electrode with is relatively far away resulting in cable chaos or a loop around the balls which can create unintended leverage effects when wiggling, breaking the vacuum seal. Now the second pole sits inside the vacuum tube. The bottom plate is very mass rich and covers a large footprint which ensures that the sensation is felt on the sounding electrode. Additionally the 4mm banana jacks sit next to each other which makes wiring easily.

The Sounding Electrode with the New Hex Toll for Easy Adjustment

The placements of the electrode offer the door for a new deviant form of play: Take the sounding electrode out, seal the hole with the plug, put a very mass-rich anal into your sub (yes, this leads to cable chaos again) and start pumping. Since the dick is most likely pointing downwards, the e-stim sensation will be felt at the pelvic area. If you not start to stimulate the sub and increase his arousal, causing the dick to jump upwards, the glans (and sometimes the shaft) makes contact with the rod, creating a tickling shock. If you really want to shock your bottom, you insulate the bottom of the contact plate with a piece of rubber. Then the only conduction point will be where the dick hits the rod, most likely starting to jump uncontrolled due to the pain, making contact again and again. Until this vicious feedback circle makes him get soft and most likely continuously touch the rod or top of the plate if he is not too small.

Left: eVac Duo 800
Right: eVac 500

Since the counter pole plate is made out of stainless steel, it conducts the currency very well, even without waterbased (special e-stim) lube for enhanced conductivity. In order to achieve a smooth e-stim sensation, the complete surface should touch the skin. Otherwise it will be a very pinchy experience. When adjusting it, be a bit careful and not pushing too hard. The leverage could otherwise push the cylinder off.

The eVac Duo 800 serves also an unexpected market: Vacuum cylinders for big boys! I can count myself lucky to have a few play buddies who have 6+cm dick diameter and who have a hard time finding accordingly sized vacuum cylinders. Naturally they are also on the far side of the length spectrum so 220mm length is a bit confining. But if you are having the same issues, VAST is probably able to print you a longer cylinder. Though if you exceed 250mm, the rods will be too short to stick out of the top.