I want to know how you can differentiate a HP from an LP and their uses and to what ports do you connect them in the first stage?
Hoses and Ports
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cloudflint
Contributor
A high pressure port is only really used for checking the tank pressure. Everything else I.E. demand valves, power inflator, drysuit inflator e.t.c runs off the low pressure connections.
On most modern regulators the high pressure ports have a totally different thread to the low pressure ports preventing you from plugging a low pressure hose into a high pressure port. also on most regulators the high pressure ports will be labelled. If the threads are all the same and the high pressure ports aren't labelled which they arent on some older 1st stages you can look down the port and the high pressure port will generally have a very small hole in it and in the low pressure port you will generally be able to see some of the internal workings of the 1st stage balancing chamber.
On most modern regulators the high pressure ports have a totally different thread to the low pressure ports preventing you from plugging a low pressure hose into a high pressure port. also on most regulators the high pressure ports will be labelled. If the threads are all the same and the high pressure ports aren't labelled which they arent on some older 1st stages you can look down the port and the high pressure port will generally have a very small hole in it and in the low pressure port you will generally be able to see some of the internal workings of the 1st stage balancing chamber.
In modern 1st stages, HP ports have 7/16 " thread and LP ports 3/8 " thread. With this you cannot attach a LP hose to a HP port and vice-versa.
Besides high pressure ports are marked as "HP" and low pressure ports as "LP".
Old 1st stages both ports had the same thread but a label by the port.
In the pic you can see an old Dacor 900 where the HP port is labeled. This 1st stage both port types have the same thread.
Besides high pressure ports are marked as "HP" and low pressure ports as "LP".
Old 1st stages both ports had the same thread but a label by the port.
In the pic you can see an old Dacor 900 where the HP port is labeled. This 1st stage both port types have the same thread.
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OP
oh ok... so what are the high pressure ports for in the first stages if it only means checking the tank pressure?
vshearer
Contributor
That is pretty much it. In the old days we didn't even have HP ports. You had a J valve on the tank that you pulled when it got hard to breathe to give you an extra 500psi, and before that you just learned to recognize when your tank was low by how the hard the regulator started breathing and then you surfaced. When men were men. :cool2:
Exactly that, checking the tank pressure, either via a SPG, or a wireless computer.
OP
here you go
this was the answer i was looking for, so the high pressure port is where the spg is connected and the hose that is used in your spg is a high pressure hose 
thanks to all those who replied, appreciate it
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