They work great, just a different color they maybe a little thicker, so hopefully they'll last longer. Also at a great price.

I have been using the Penimaster system now for almost 4 years and these grey sluices are by far the best quality. They last a long time without tearing or breaking.

As mentioned in other reviews, the yellow sluices were much better than the new gray ones. Material is much thinner and allows for better suction.. now you can feel your glans slip in/out very easily. It's a shame.

The replacement sluices work but irritate the skin. The old ones are show much better.

The material of the new thicker, "grey" diaphrams and sluices are about 2-3x thicker than the light beige ones. By comparison, the light beige ones are probably 3-4 mil in thickness, and the new gray ones are probably somewhere in the 7-9mil range. The sluices work just fine because there is minimal stretching while in use, but the new grey diaphrams are absolutely worthless. There simply isn't enough suction from the bulb pump to pull the glans in, or expand the diaphram all the way.

I followed the directions for stretching them out. Placed one in warm water, stretched, and repeat. I still could not get them to work. The "bulb" pump simply doesn't allow enough suction to expand it all the way. I could not get enough suction to pull my parts into the glans chamber. I tried for 4 days, warming and stretching the same diaphram. Still. Would. Not. Work. The material is too thick, it doesn't have enough stretch, no matter how much I try.

I ordered 6 (3 pair) and have tried the repeated warm water and stretching routine with 4 of them. For days on end. Very disappointed. Why would PM mess with a product that already works? Are people using some alternative forms of suction that are strong enough for the diaphrams to work? The gray sluices work fine, the gray, not so much.

Looks like I'm out of some cash, and may have to use my PM without the diaprham.