Onahole structures fall into two broad categories: “through-hole” types, where the internal tunnel runs all the way to the other side, and “non-through” types, where the interior is closed at the far end.
Even when they look similar on the outside, they differ in how air escapes, how you clean them, and how easy they are to dry. Opening structure is one of the things worth checking if you're thinking about how easy a product will be to handle after purchase.
This article compares through-hole and non-through onaholes in terms of structure, usability, ease of washing, and ease of drying.
Table of Contents
What Is a Through-Hole Onahole?
A through-hole type has a slit running from the entrance to the far side, open at both ends. Because there's a path for air and water to pass through, it's usually easier to rinse and dry the interior.
That said, the feel of use still varies with internal shape and opening size. “All through-hole types are the same” isn't true.
What Is a Non-Through Onahole?
A non-through type has a slit running from the entrance that's closed at the far end. Because the far end is closed, how air and lubricant escape from the interior depends on the product's structure - some products let you adjust this with an air vent.
Like through-hole types, non-through types also vary in feel from product to product based on interior depth, ridges, and material firmness.
See the article below for more on materials and internal structure in general.
Main Differences Between Through-Hole and Non-Through Types
How Air Escapes
Through-hole types are open on the opposite side, giving them a structure where air escapes easily.
Non-through types, on the other hand, are closed at the far end, so some products let you feel the internal pressure change more distinctly. That said, this varies with whether there's an air vent and the internal shape, so the feel differs by product.
Ease of Washing
Through-hole types let you run water through from both sides, while non-through types are closed at the far end. You'll need to rinse repeatedly to make sure water and cleaning agent don't linger deep inside.
Ease of Drying
Through-hole types tend to be easier to drain, since air flows through from both ends.
Non-through types tend to hold moisture at the far end more than through-hole types do. Drain them entrance-down and use a drying stick or similar to remove moisture thoroughly.
Handling Lubricant
With through-hole types, lubricant can sometimes overflow from the far side as well as the entrance during use, so you'll need to adjust the amount to avoid making a mess where you're using it.
With non-through types, lubricant only overflows from the entrance, but it can be more prone to lingering during washing. Rinse thoroughly and carefully after use.
Which Should You Choose?
When choosing between through-hole and non-through, the following points are worth considering.
If You Prioritize Ease of Care
Through-hole types, which let water pass through easily and can be checked from both sides, are generally considered easier to maintain. That said, some products have complex internal ridges even in a through-hole design, so washing can still take effort - keep that in mind.
If You Want a Closed Interior Structure
A non-through type is an option for people who prefer a structure closed at the far end. Before buying, check whether it has an air vent, how deep it is, and the interior shape.
A Point on Washing
Whichever type you choose, wash it as soon as possible after use. See the article below for a detailed explanation of the basic care method.
Ease of Washing and Drying Matter More Than the Feel of Use
The difference between through-hole and non-through onaholes comes down to whether the slit runs all the way through or not. Because this shape difference affects how much effort washing takes, it's worth paying attention to.
That said, size, material, and feel of use vary by product, and each type has its own trade-offs. Choose the product that matches your preference, weighing ease of washing, ease of drying, and how lubricant behaves.