Details Description 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 Lee’s Ultra Gravel Vacs #11544, #11545, #11555, #11556, #11558 and #11560. With the included adapters, fits 3/8″ I.D. hose and Lee’s Ultra Gravel Vacs #11551, #11552, #11553 and #11554.