I use these cups in my Reefer 750 XXL so when I bought my new 425 XL I had 2 cups and 2 socks. I can't stand on my toes so I bought 2 of these mugs. Pros: I just fill the cups with floss, filler, etc. and I'm ready to go without putting on slimy, dirty filter socks and cleaning them. They are strong, fat and tall. Flow slots, especially compared to some aftermarket cups I've used that didn't have the same water flow. They fit my sock garters really well and slide in and out with ease. You will save so much time on tank maintenance. , I just pull out the dirty thread, throw it in the bin and replace it with a new thread. done Cons The only downside to these mugs is the price, but you need to find out how much time you save each week using them and how easy it is to filter the material. There are changes, and you don't mind paying a few bucks for them.
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