When using this product, how do you remove the air that I assume is already in the hose so that you don't inject air into your system?

The only way I know to remove any air in the hose is to loosely attach to the service port and open the valve of the fitting connected to the refrigerant source. You only need to open it for a second or so to purge air from the hose then you can finish tightening the hose to the service port.

What piece are we missing between this and the retrofit valve?

You should be able to directly connect the hose to your piercing valve and the other end would be connected to your can of refrigerant.

The quick coupler side does not fit on our Subaru

Don't know what year your Subaru is and I'm not a car mechanic but from what I understand the coupler should work if your system is R134 based. Some car makers may have systems which use a different freon type which might require a different fitting. Prior to R134 was R12 but that was for cars in the 60s, 70s and maybe 80s.

What should the meter reading be for a system fully charged with 134a?

Between 3 and 5 on the smaller unit of measure. These systems don't take very much.

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R134a Refrigerant Recharge Kit, AC Recharge Hose Kit with Gauge, R134a Freon Can Tap Recharging Hose with Detachable R134a Quick Coupler for AC Refrigerant System

R134a Refrigerant Recharge Kit, AC Recharge Hose Kit with Gauge, R134a Freon Can Tap Recharging Hose with Detachable R134a Quick Coupler for AC Refrigerant System

Product ID: 159811439

Details

Brand
Belleone
Color
Blue and
Item Length
19 inches
Item Weight
10.8 ounces
Manufacturer
Belleone
Material
Metal

📊Multi-scale gauge for R134a, R12, R22

📏19-inch durable hose length

🔧Corrosion-resistant metal & high-pressure rubber

Description

❄️ Recharge Like a Pro, Stay Cool Always!

COMPACT CONVENIENT - 19-inch hose length with detachable quick coupler for easy storage and hassle-free recharging anywhere.
LEAK PROOF CONFIDENCE - Inside gasket design prevents refrigerant leaks, protecting your AC system and environment.
UNIVERSAL COMPATIBILITY - Seamlessly connects with R134a, R12, and R22 refrigerant ports, including piercing and self-sealing cans.
BUILT TO LAST UNDER PRESSURE - Crafted from corrosion-resistant metal and reinforced rubber hose rated for up to 350 PSI.
PRECISION CONTROL AT YOUR FINGERTIPS - Clear, multi-scale gauge ensures accurate refrigerant levels for R134a, R12, and R22 systems.

The Belleone R134a Refrigerant Recharge Kit features a 19-inch corrosion-resistant metal hose with a high-pressure rubber build, a clear multi-scale gauge compatible with R134a, R12, and R22 refrigerants, and a detachable quick coupler with leak-proof gasket design. Perfect for professional-grade AC system maintenance, it offers universal compatibility and precise control to keep your vehicle or equipment running cool and efficient.

Specifications

ASIN	B07WK5Y31F
Best Sellers Rank	#82,574 in Automotive ( See Top 100 in Automotive ) #9 in Automotive Replacement Refrigerant Retrofit Kits
Brand Name	Belleone
Color	Blue and Copper
Customer Reviews	4.4 4.4 out of 5 stars (806)
Item Length	19 inches
Item Weight	10.8 ounces
Manufacturer	Belleone
Material Type	Metal
Maximum Pressure	350 psi
Outside Diameter	19 inches
UPC	758277586771
Unit Count	1 Count

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