Can someone please tell me if the smaller, yellow capped fitting on the left is a vapor or liquid tap? It has an ACME fitting on it (like on your BBQ grill hose) and I would like to run a propane heater from it. The heater has a regulator on the hose that can accept tank pressure. If this is a liquid tap, can I use it to refill my small LP tank?

I know the big one is used to fill the tank. I have searched for the valve online (Rego, Multi Valve 2593), but can't find any information.

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1986 SE Aero coupe.

3.4 DOHC swap is complete and running, now just have to finish the rest of the car...

I think the small yellow cap is a bleed valve they open when filling the tank. The line and the red device are the line and regulator for the devices operating from the tank. If you want to plumb it to an extra heater, Im pretty sure you need to add a T fitting where that line goes into the tank, and run a new hose with a regulator to the aux heater, and reconnect the original line to the other side of the T. Whatever is running off the gas currently, probably has a different operating pressure (thus the need for another regulator) than an aux heater/grill your adding.

Im not a gas expert by any means, just relating this to whats on my RV.

Well, searching for the part number on it got me this:

http://www.gasequipment.com...0-098_RepairKits.pdf

That says on the last page that it's been replaced by the 8593AR16.0 which led me to this:

http://www.regoproducts.com...oductpdfs/8593ar.pdf

Does that help?

EDIT: The small ACME connection appears to be called "Vapor Equalizing Connection" which leads me to believe Roger is correct. But I have NO IDEA what's going on here.

[This message has been edited by Zeb (edited 12-22-2015).]

You need an adapter for the large fitting. Here

Most RV dealers will stock them also. Be sure to read the reviews for proper instructions.

quote 66 of 66 people found the following review helpful MUST FREEZE small tanks before refilling! By Casey F on September 7, 2014 Propane will always migrate from warm to cold. If both tanks are at room temperature you will only be able to fill the small tank about half way. In order to fill your small propane tanks with the maximum amount of propane from the big tank it is always best freeze the small tanks in your FREEZER for at least 1/2 hour to an hour minimum before refilling. Preferably overnight for best results. Put the adapter on the big tank before taking a small tank out of the freezer. Brass deforms very easily, so remember not to over tighten the adapter to large tank with a wrench. Hand tighten only until firmly fully seated on the valve. Quickly attach smaller tank taken from the freezer to the adapter, onlybby hand until just seated. Do not over tighten. Open valve on big tank then immediately flip over the big tank with small tank attached upside down and listen to the sound of the propane filling the small tank. It should take less than 2 minutes to fill. You will hear the propane sound diminish quickly and turn into a trickle sound. When the Trickle Sound stops reach down and close the valve before flipping back upright. This will insure maximum filling retention in the small tank. When removing small tank use both hands to quickly spin the tank off the adapter. It should pop right off. Remember to listen to the small tank after refilling it to make sure there isn't any leaking from the seal. 6 Comments Was this review helpful to you? Yes No Report abuse 34 of 36 people found the following review helpful Refilling small tanks is not a process for idiots. Normal people will find it great! By hanghank on December 7, 2014 Rule #1: If it doesn't work, it is someone else's fault! NOT! I have a refill adapter from another manufacturer, but the process is identical. A propane container is LP that is part liquid, and part gas. A cheap/quick way to see how full/empty your tank is is to pour very hot water down one side, then feel the tank from bottom up. You will note the liquid level by the cooler temperature there, with the gaseous upper portion much warmer. With the "main" tank right side up, only gaseous LP will come out. You must invert the tank to get the compressed liquid LP you want. CAUTION! AN INVERTED TANK WILL DISCHARGE LIQUID LP WHICH CAN FREEZE BURN YOUR SKIN IMMEDIATELY! Wearing gloves will offer much protection for the small amounts of gas that may be released when connecting and unconnecting. I suggest doing all the hooking up and unhooking with the main tank right side up to alleviate the liquid danger. I put my empty bottles in the freezer to reduce the pressure and make fuel transfer easier. In my experience, any fuel that is going to transfer will do so in the first 30 seconds or less. Just listen: if it isn't hissing, it's done transferring. If your small tank doesn't feel full, weigh it, (best) or use the hot water trick above. IF GUESSING, IT SHOULD NOT EVER BE MORE THAN 3/4 FULL TO ALLOW FOR EXPANSION WHEN WARMED UP! The little valve you see on the top if the tank is a safety over-pressure relief valve. IF YOU OVERFILL, WHEN WARMED IT MAY RELEASE VERY FLAMMABLE GAS AT THE MOST EXCITING MOMENTS!! If not full, repeat the freeze-fill process. Suggested steps: 1) Cool the receiving tank - freezer best. If out camping, use ice water. 2) Warm sending tank - sunshine works. You could set it on the campfire, but observe results from a looooong distance! ;~) Second thought: use your neighbor's campfire.... ;~) 3) WEARING GLOVES screw the adapter onto the receiving tank. 4) With the sending tank upright, screw the small tank with adapter onto the sending tank. 5) Don't open the valve until you have inverted the assemblage. 6) Keeping your hand(s) away from all the connections, slowly open the valve. If no leakage, open valve fully. 7) Wait until hissing stops, but not more than 30 seconds. 8) WEARING GLOVES close valve securely. Turn assemblage "right-side up". WEARING GLOVES Screw receiving tank AND adapter off from sending tank. Unscrew adapter from receiving tank. If it costs you $20 to fill a 20# large tank, you are refilling the small tank for $1.00. What's not to like about that! (I will not explain how I know about the gloves..... ;~)

It's dangerous, be careful. I nearly froze my face off once doing this on a drilling rig in Colorado.

Edit: propane is in liquid form when it's below NEGATIVE 44°F (-44) read this to better understand what you are dealing with https://www.propanecarbs.com/propane.html

[This message has been edited by WBailey1041 (edited 12-22-2015).]

quote Can someone please tell me if the smaller, yellow capped fitting on the left is a vapor or liquid tap?

That, depends whether there is a dip tube installed in the bottom of that multivalve. It would extend down into the liquid volume of the propane in the tank.