Oh, its the "miracle" pump (Vaccum pump)that cpr recommends for starting and maintaining syphon with their overflows. Here i'll toss you a pic. It works on a flapper system and they become fouled about every three months. Marine depot is the only place that has them, luckily they only go for 12 buck each. I will say that they are the perfect solution to auto-top off when coupled with the ultralife float switch.
Here's to swimmin with bowlegged women.
Reef with 30G Sump/Fuge Combo
-30G LTAnemonarium with mated porcelain crabs, 10 sexy shrimp, and 2 pink skunks all tied into the other 135G in my system.