Negative pressure gas cylinder gas tank, top (1 port or 2 ports or 3 ports or 4 ports or 5 ports or 6 ports or 7 ports or 8 ports), top (1 port).

The parameters are as follows: negative pressure gas cylinder gas tank, top (1 port or 2 ports or 3 ports or 4 ports or 5 ports or 6 ports or 7 ports or 8 ports), top (1 port ).