4 inch black silicone Concave SPD plug with long tapered tip and retention valley on a grid background
Dimension specifications matrix table for the large-format CON SPD silicone retention nozzles ranging from 3.25-inch to 4.0-inch diameters, displaying total length, insertable length, tapered tip length, retention valley size, and safety flange diameter.
Vertical 3D model render of a white CON SPD 3.25-inch silicone retention nozzle showcasing its tapered entry tip, concave expansion slope, and retention valley.
4 inch black silicone Concave SPD plug with long tapered tip and retention valley on a grid background standing with tip up

CON SPD 3.25-4.0"

Regular price$70.00
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The CON SPD is a large-format design available in four diameters: 3.25", 3.5", 3.75", and 4.0". It follows the same shape as the rest of the CON SPD line, just scaled up.

How it works

The tip starts narrow (roughly 1") and gradually widens through the main expansion, then narrows into a retention valley before reaching the base flange. All four sizes share the same proportions, just scaled to a larger overall diameter.

Choosing your firmness

Because these are very large-diameter pieces, firmness matters more than usual. Bob recommends #00-20 (Very Soft) for most users, with #00-50 (Soft) available if you want a bit more structure. He doesn't recommend #10 or firmer for these sizes unless you're already very experienced with large-diameter pieces.

If you're unsure which firmness to choose, we recommend ordering our silicone firmness samples first.

Color options

#18 and #30 are available in pure translucent.
#00-20, #00-50, and #10 are translucent white base materials and can be mixed with standard colors.

Please note

This is a very large-diameter design intended for highly experienced users.
Everyone's anatomy is different, and we cannot guarantee that a particular size will be suitable for everyone.
Use appropriate lubrication, never force the product, and stop if you experience pain or significant discomfort. Inspect the silicone before each use and do not use it if damaged.

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C
Chris Hogan

Love this design very comfortable would highly recommend this nozzle