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12 Best Vac-U-Lock Dildos | Vac-U-Lock Strap on Compatible Dildos

10 Best Vac-U-Lock Dildos | Vac-U-Lock Strap on Compatible Dildos

Vac-U-Lock dildos are a hot commodity in American bedrooms everywhere. This premium brand of strap on harness kit features some of the most realistic looking and feeling dildos you'll find for any strap on.

Its popularity is surely accented by the fact that the adjustable Vac-U-Lock strap on harness features a wide open crotch so men can wear it too making it one of the most versatile unisex dildo harness systems for everyone!

What is Vac-U-Lock? If you're new to strap on sex play, check out my users guide with video demos and full instructions on Doc Johnson's hallmark sex toy for couples.

Once you're “in the know”, carry on to discover the 10 best Vac-U-Lock strap on dildos along with my own Sexpert review and comparison before buying your new attachment online.

What you need to know: Vac-U-Lock dildos are only compatible with a “plug and adapter” style strap on. They will not fit in a standard harness O-ring.

The base of every Vac-U-Lock compatible attachment has a hole that connects to the plug on the front of the harness. Start by purchasing this Vac-U-Lock Harness, then add any of the dildos below to create your own custom strap on harness system.

12 Best Vac-U-Lock Dildos


Vac-U-Lock UR3 Realistic

1. Vac-U-Lock UR3 Realistic Dildo

Vac-U-Lock UR3 Realistic Dildo is a thin and small, extra soft silicone attachment. It features a flexible and bendable shaft that is so soft and malleable, you may need to use both hands to insert it into the vagina.

It's the most popular choice for seniors who need to use a strap on for sex because of erectile dysfunction; this attachment is by far the most gentle of them all. UR3 is Doc Johnson's own ultra realistic feeling soft silicone skin.

The narrow head is thin in comparison to all the dildos that come included with the pre-made Vac-U-Lock strap on systems; if you think those are too wide then choose the harness alone and add-on this toy to create your own small sized realistic feeling strapon kit.

  • Length: 7 inches
  • Diameter: 1 1/4 inches across the top, 1 1/2 inches mid-shaft
  • Material: UR3 (silicone)

Vac-U-Lock Perfect Dildo

2. Vac-U-Lock Perfect Dildo

The most impressive feature of the Vac-U-Lock Perfect Dildo is the oversized mushroom shaped circumcised head. It's an exaggeration of anything you'd experience in real life, and is a popular feature on many different types of women's sexual toys.

Bursting veins and bulges accent the realistic feel bringing home a hot and heavy experience in an “intermediate” size. A best seller for many years and one of the original attachments for the Vac-U-Lock strap on.

As you can see in the photo, the Vac-U-Lock Perfect Dildo angles back slightly from the testicles so it stands more upright when attached to the harness. The sensually smooth rubber shaft can bend and flex slightly too.

  • Length: 8 1/4 inches
  • Diameter: 1 3/4 inches
  • Material: Soft rubber

Large Vac-U-Lock Attachment

3. Large Vac-U-Lock Attachment

The Large Vac-U-Lock Attachment is the biggest dildo that comes included in the base Vac-U-Lock system. It is available for sale separately in 3 color options for couples to create their own combination.

In person, it looks shockingly realistic with a deeply cut mushroom tip and wide, rounded penis head. The smooth and luxurious rubber is among the highest quality realistic looking attachments for Vac-U-Lock. Top shelf quality & feel!

The shaft is bendable but because it's so large, it has plenty of heavy density for giving your lover a good time in bed. Complete with flat balls at the base to help support the weight of the penis shaft above when attached to the strap on adapter plug.

  • Length: 8 inches
  • Diameter: Slightly under 2 inches
  • Material: Premium rubber

Vac-U-Lock Ballsy Dildo

4. Vac-U-Lock Ballsy Dildo

The Vac-U-Lock Ballsy Dildo is the best Vac-U-Lock attachment for first timers. The cute & perky thin ribbed shaft with adorable testicles offers a light & airy look that won't intimidate the beginner.

Couples often buy both - the Small and Medium because they each have a unique shape and stance so they feel different from each other. The girth measurements are the same, the length is the only difference between the 2 size options.

Even if you prefer sex toys with a thick girth, the ballsy dildo should still be on your radar because of the wildly ribbed and heavily veined texture. There is no other toy quite like it, so fans of texture shouldn't pass it by!

  • Length: 5 1/2 inches (small) 7 inches (medium)
  • Diameter: Ranges between 1 1/4 inches and 1 1/2 inches
  • Material: Soft rubber

Vac-U-Lock Classic

5. Vac-U-Lock Classic

Vac-U-Lock Classic is the traditional shape of the original Doc Johnson dildo first released a hundred years ago. Okay maybe that's an exaggeration, but it's been around since my days as a brand new sex coach 15 years ago!

The wide, blunt head is the most sought after feature offering an immediate stretch upon entry and a chunky ribbed shaft all the way through. It's considered “slightly larger than the average” and is a best selling attachment for couples who want an upgrade in size from a small attachment.

It is the cheapest strap on dildo for this harness system so couples who want to maintain strict budget when shopping for sex toys will choose this one. But don't worry - even though it's cheap, you'll get the same high quality that Doc Johnson is so famous for!

  • Length: 7 3/4 inches
  • Diameter: 1 3/4 inches
  • Material: Rubber

Realistic Vac-U-Lock Dildo

6. Realistic Vac-U-Lock Dildo

This impressive creation is available in 2 sizes Medium and Large. It is also the same toy that comes with the premium kit.

Soft succulent dual density surface perfectly recreates the warmth and feel of an erection. Both size options feature a wide head that feels like a naughty fetish delight, ideal for strap on sex! The highest quality Ultra Skin material from Doc Johnson assures the utmost in luxury and performance.

The gentle surface is made for slow and romantic lovin' and is the best choice for seniors who use the Vac-U-Lock system for their erotic needs despite the man experiencing erectile dysfunction.

  • Length: 6 inches (medium) 8 inches (large)
  • Diameter: Slightly over 1 1/2 inches (medium) Slightly under 2 inches (large)
  • Material: Ultra Skyn (soft silicone)

Vac-U-Lock Natural

7. Vac-U-Lock Natural

Vac-U-Lock Natural is the best Vac-U-Lock dildo for couples seeking a sturdy toy for hard and vigorous sex. It's tailor made for rough sex and the sturdy life like shaft can pound away all night long. It's heavy duty but not too large making it an excellent fetish toy for couples who want to keep the massive size at a minimum.

The thin head inserts easily compared to the large heads of other options out there so it's the best “trainer” strap on attachment for couples looking to try a wider girth for the first time during strapon sex playtime.

  • Length: 7 inches
  • Diameter: 1 1/2 inches
  • Material: Premium rubber

Vac-U-Lock Small Dildo

8. Vac-U-Lock Small Dildo

Vac-U-Lock Small Dildo is the smallest realistic attachment for the Vac-U-Lock strap on. This friendly little fella has life like features in a tiny size that better fits petite women and seniors.

It stands at an angle from the scrotum, but you'll notice this points the dildo upright when attached to the harness for easier vaginal penetration. The realistically rounded small penis head and soft premium rubber shaft are great for comfortable hands free use.

  • Length: 5 1/4 inches
  • Diameter: 1 1/2 inches
  • Material: Premium rubber

Pleasure Tools 7 Inch Dildo

8. Pleasure Tools 7 Inch Dildo

Pleasure Tools 7 Inch Dildo is an off brand toy that is compatible with the Vac-U-Lock strap on adapter plug. It has a slick surface when wet, so make sure to add on plenty of water based lube and enjoy the glide!

Sturdy and perfectly textured heavily veined shaft withstands your most vigorous sexual fantasies while the “average” girth size maintains the receivers comfort at all times. Available in both white and brown skin tones.

  • Length: 7 inches
  • Diameter: 1 1/2 inches across the head, 1 3/4 inches across the base
  • Material: Rubber

Pleasure Tools 7 Inch Dildo

10. Pleasure Tools 8 Inch Dildo

Pleasure Tools 8 Inch Dildo is an off brand toy that is compatible with the Vac-U-Lock strap on adapter plug. If you crave the “pop” of a massively overhanging mushroom head this is THE attachment you must buy.

Serious pleasure comes easily with this bad boy, the shaft can squeeze when you pinch it hard but otherwise maintain a good firm texture perfect to deliver the intense sexual pleasure from those raised veins and large circumcised head. An exciting new addition just added in 2021.

  • Length: 8 inches
  • Diameter: 1 1/2 inches across the head, 1 3/4 inches across the base
  • Material: Rubber

Technician Tool

11. Technician Tool

Technician Tool is the longest attachment available for the Vac-U-Lock strap on harness. Although it is an off-brand, it will fit perfectly with the harness adapter plug. If you're dreaming about a long shaft that just keeps going on and on, Technician is your dream come true!

All the while, its thickness is kept at a reasonable size as not to overwhelm the receiver. In our opinion, the slippery rubber surface and thick torpedo shaped mushroom penis head is completely lustworthy, one of the most unique options we've seen in a long time.

  • Length: 9 inches
  • Diameter: 1 3/4 inches
  • Material: Rubber

Vac-U-Lock Kong

12. Vac-U-Lock Kong

The huge Vac-U-Lock Kong is probably one of the worlds most famous massive dildos. Being a Doc Johnson product, naturally it found a new home within the Vac-U-Lock sex toy product range.

Be warned: It's NOT for the faint of heart! He's a giant behemoth with a massive mushroom head and bulging erection shaft with life like veins and dimples; a giant dick amplified from real life. If you're a size queen or want to enjoy pure freaky sex, the Kong is your best choice. Grab a tape measure before ordering to make sure you can actually take him all in - it really doesn't get any bigger then this!

  • Length: 9 inches
  • Diameter: 2 1/4 inches
  • Material: Premium rubber

Customizing your own Vac-U-Lock Strap On

Before I set you free to explore the joys and intricacies of harness play, it's important to address how to connect the attachment to the harness. Don't just push the plug into the hole.

Pushing it on directly will stress the material and build vacuum suction in the space between the hole and the plug making it very difficult to remove the dildo later on. Sprinkling talcum powder in the hole beforehand acts as a lubricant to reduce the vacuum suction created.

You'll need to twist the attachment into the plug, not push it directly on. View the quick video demo showing how to connect the pieces together. As you can see in the video, twisting it on requires force at first but once the adapter ridges “lock” into place, it “pops” right on. Sturdy, firmly locked in place and ready for your sexual adventures!



Click to buy Vac-U-Lock toys online.



Mayla Green

Mayla Green has been involved in the sex toy industry since 2004. Working behind the motto “Sex TOYS should be FUN”, Mayla provides unique tips & advice amassed from over a decade of hands on experience with adult products. She also coaches clients how to fully enjoy sexual pleasure and can be seen in major publications & magazines online.

Happily married since 2009, she knows firsthand how the sex life eventually becomes repetitive (which truthfully means boring), so if you're looking to spice things up in the bedroom, Mayla's your gal! Her literary pride & joy is covering topics for established couples needing inspiration to keep lovemaking exciting and fun.

Not in a relationship? Her other focus is teaching women how to properly handle the “little person in the canoe” to experience the best orgasms ever, no partner required! Her creative and innovative tips, techniques and advice is on par with a certified sex therapist or Sexologist, but with an extra advantage from her knowledge of the adult toy business.

View all articles published by Mayla Green exclusively for The Adult Toy Shop sex blog. Mayla Green's Linkedin profile highlights her professional background, experience and training.

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