Every time you move a hose or strip a first stage down for travel, you need a port plug ready to go. These are the genuine replacement plugs for Dive Rite XT1 and FT1 regulators, so they thread in right and seal the way they should. Pick up a couple of each and keep them in your save-a-dive kit. It's a small part, but it's the one that lets you reconfigure your reg on the boat instead of sitting out a dive.
