Hetar hose clips

Has anyone removed the heater hose clips at the bulkhead at the back of the engine? How do you do it? Do I need to replace them after they are out or are they re-useable? Probably need to remove these soon for manifold change. (I can spell heater BTW).

I've just read the Haynes manual and it says "remove the heater pipes from the engine pipe stubbs" instead of removing it form the bulkhead, so I guess problem solved as I think they are Jubilee clips which hold the pipes on there.

ShadeTek do you mean these that go throught the firewall?

Just push the plastic clips on both sides of the hose in, and then pull on the hose to remove.