- The Squeeze-Bulb Siphon Starter is so efficient, that siphoning is easy no matter what the level of water in the aquarium. - Fits 1/2" I.D. hose and Lees® Ultra Gravel Vacs® #11544, #11545, #11555, #11556, #11558 and #11560. - With the included adapters, fits 3/8" I.D. hose and Lees® Ultra Gravel Vacs® #11551, #11552, #11553 and #11554.