LP Gas tank fitting from regulator

[DoubleD]

I’m replacing the propane system components in the tank locker and bought a new regulator, solenoid and hoses. The new fitting from the regulator that goes into the tank fitting, has a much smaller orifice than the one connected to my tank. Although it appears the new fitting will fit in my tank fitting, I’m not sure they are compatible. What am I missing or do I need to upgrade my tank, or maybe I ordered the wrong regulator? See photos.


thanks,
DD

[donradcliffe]

No worries. The hole is plenty big enough. Your "new" regulator has a POL connector, which is being phased out, but will still work with the tank which has both a POL and a Type 1 connector. The Type 1 has big threads and is a right hand thread, while the POL has a smaller left hand thread inside the tank valve.

[DoubleD]

The POL that came with the new regulator is on the left with the tiny hole. The original is on the right. Should I just purchase a regulator with a type 1 connector, which I assume are the big black plastic knob, like on my BBQ at home. I'm assuming the regulator and POL orifice size are related, such that I shouldn't use the new regulator on the old POL.


DD

[donradcliffe]

Originally Posted by DoubleD

The POL that came with the new regulator is on the left with the tiny hole. The original is on the right. Should I just purchase a regulator with a type 1 connector, which I assume are the big black plastic knob, like on my BBQ at home. I'm assuming the regulator and POL orifice size are related, such that I shouldn't use the new regulator on the old POL.


DD

The hole is on the high pressure side of the regulator. If the hole is 1 mm in diameter, it will theoretically pass 15 gallons of propane per minute with 100 psi behind it.

[DoubleD]

I'm still working out my propane upgrades. Looking at the tank valve, it has an O'ring, which the new POL male fitting does also. I struggle to believe these two fittings are compatible. My original POL fitting (on the right in the photo) does not have an O'ring, which makes sense since the tank side does. What am I missing?


DD

[wholybee]

Originally Posted by DoubleD

I'm still working out my propane upgrades. Looking at the tank valve, it has an O'ring, which the new POL male fitting does also. I struggle to believe these two fittings are compatible. My original POL fitting (on the right in the photo) does not have an O'ring, which makes sense since the tank side does. What am I missing?


DD

Looks normal to me. Have you screwed them together and checked for leaks?

[DoubleD]

I've screwed them together, but haven't turned the gas on yet as I'm trying to piece the other parts together. Issue is there is so little room in the tank locker, it's been a challenge configuring the system so it fits. I'm replacing all the components but the tank.


DD

[pesarsten]

I would strongly suggest that you consult with a qualified LP gas installer, There are many different combinations of regulators available and most are not suitable for use on a boat. I have investigated many LP "accidents" and none were pleasant and most involved self installed components. I am sure that you can consult with someone who can assist you with your installation. Start with a local LP gas supplier who installs residential LP appliances. They will likely help you for free if you are purchasing from them.

As a note , I believe that your on board system must be fitted with an "integral two stage regulator" , a remote shut off valve , and a gauge. If you are not familiar with the components please get some help.

[Ballsnall]

Originally Posted by DoubleD

I'm still working out my propane upgrades. Looking at the tank valve, it has an O'ring, which the new POL male fitting does also. I struggle to believe these two fittings are compatible. My original POL fitting (on the right in the photo) does not have an O'ring, which makes sense since the tank side does. What am I missing?
DD

Your new fitting is still a POL or more correctly a type 21. The oring was a latter modification that's all. Both styles are interchangeable and in common use. The only other fitting available is the type 27 which has an external acme thread on the cylinder but the new cylinder valves also accept the original type 21 LH internal thread.