The Capillary Tubes & Fittings category includes the precision metering components used in small-capacity refrigeration and air conditioning systems. Capillary tubes provide a fixed orifice that meters refrigerant flow into the evaporator, maintaining the pressure drop needed for cooling without the use of a TXV or electronic valve.
Here you’ll find capillary tubing coils, pre-cut cap tube sections, flared and solder fittings, adapters, inline filter screens, cap tube unions and OEM-style replacement assemblies. These are essential for servicing mini-fridges, window units, dehumidifiers, ice makers, small commercial cases and compact HVAC equipment.
When selecting capillary tubes and fittings, verify ID size, length, refrigerant compatibility (R134a, R600a, R410A, R22), operating pressure, evaporator load and OEM specifications. Cap tube sizing is extremely sensitive—small variations in diameter or length significantly impact system capacity and performance.
Pro tip: Always measure and match the original cap tube length and diameter. Even slight mismatches can cause floodback, poor cooling, excessive superheat or compressor overheating.
Capillary tubes, fittings, cap tube unions, inline screens, and replacement assemblies for refrigeration and compact HVAC systems including mini-fridges, window units, dehumidifiers and ice makers.
