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The Bolton Tools YS-121B is a three-way brass manifold gauge set for AC and refrigeration work, covering R410a, R134, R22 and R32. It pairs a blue low-side gauge (-30 to 120 PSI) with a red high-side gauge (0 to 500 PSI), both with color-coded dials and sight windows. The kit includes 60-inch color-coded charging hoses and two R410a charging control valves, which help hold refrigerant during charging. It suits technicians and serious DIYers servicing several refrigerant types; against budget two-way sets it adds a third service port and the retention valves, but it is a manual manifold with no digital readout or micron gauge.
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Lowest price we've seen: $28.00 on Nov 13 at Bolton Tools; highest $33.67 on Nov 2. Tracked across 3 stores since Nov 2.
This is a 3-way A/C manifold gauge set with a double-movement brass manifold. It works with R410a, R134, R22 and R32 refrigerants. The set includes a blue low-pressure gauge and a red high-pressure gauge.
The dials are large, with a color-coded scale and a sight window. The set comes with 60-inch color-coded charging hoses made of rubber, nylon and resin. Each hose end has a 1/4" female brass fitting. The R410a refrigerant retention charging control valve helps control charging.
