Auto-Siphon, 3/8" (Standard), from Fermtech
This standard size 3/8 inch Auto-Siphon from Fermtech is great for starting siphons. Just put your full carboy or bucket on a table, hook up your 3/8" or 5/16" inner diameter siphon tubing to your Auto Siphon, let the Auto Siphon fill with some liquid, and with one or two pumps start your siphon. It's easy and sanitary.
5/16" ID tubing fits slightly better with this Auto Siphon.
Can be clamped to your bucket using the 3/8" auto siphon clamp.