Poseidon Rebreather Port Cover

A friend of mine is a dive instructor and owns a Poseidon SE7EN Rebreather. He needed a cap to protect a manifold (port cover) during transport and between dive trips. This is what I designed for him and the fit was great. You should use an old o-ring that was replaced during your last maintenance for this port cover as the friction of that o-ring is what holds this plug in place.