• Easy to use
• Fits all standard anesthetic gas machines
• Smooth Wall Tubing (SWT) Circuits reduce circuit resistance
• Reduced resistance means they can be used for smaller patients
• Smaller diameter tubing reduces circuit volume by up to 75%
• Reduced circuit volume improves response and efficiency
• SWT Circuits are kink-resistant
• MRI Compatible
• Easy to clean and dries thoroughly and quickly
• Two sizes: Small (12 mm) for animals up to 45#, and Large (16 mm) for animals over 45#

Smooth Wall Breathing Circuits

Less Resistance – More Efficient

Fits all standard anesthetic gas machines

They dry quickly and completely!

Heated and Non-Heated

SWT Rebreathing Circuit - 12mm - for patients weighing 5 - 65 pounds (2 - 30 kg)

Darvall Smooth Wall Tubing (SWT) Circuits  use low resistance, low volume, small diameter tubes. 

This new concept in circuit design offers HUGE efficiency advantages for the patient as well as for your practice.

Features & Benefits:

Smooth Wall Tubing Circuits reduce circuit resistance
Lower resistance means they can be used for smaller patients
Smaller diameter tubing reduces gas volume by up to 75%
Reduced circuit volume improves system response to changed anesthetic settings
SWT Circuits are kink-resistant
Easier to clean than the standard corrugated tubing breathing circuits
MRI Compatible
Dries Quickly and Completely

Darvall Smooth Wall Tubing (SWT) Circuits  use low resistance, low volume, small diameter tubes. 

This new concept in circuit design offers HUGE efficiency advantages for the patient as well as for your practice.

Features & Benefits:

Smooth Wall Tubing Circuits reduce circuit resistance
Lower resistance means they can be used for smaller patients
Smaller diameter tubing reduces gas volume by up to 75%
Reduced circuit volume improves system response to changed anesthetic settings
SWT Circuits are kink-resistant
Easier to clean than the standard corrugated tubing breathing circuits
MRI Compatible
Dries Quickly and Completely

Darvall Heated Smooth Wall Tubing Rebreathing Circuit - 12mm - for patients up to 65 pounds

SWT Heated Circuits Features & Benefits:

Heating wires wound through inspiratory hose

Temperature of delivered gases measured at Y-piece & displayed

Hypothermia risk reduced, particularly in smaller animals

Can be used heated or non-heated

Requires the Darvall Heat Control Unit (#8516) for heated use (sold separately)

Heated Circuits - Reduces Hypothermia, particularly for smaller animals.

Available to the US Market, the first HEATED, temperature-controlled breathing circuit of its kind.  This new heated inflow hose was developed by veterinarians to address the problems of hypothermia in anesthetized veterinary patients.  Our breathing circuits can be used for all veterinary rebreathing anesthesia, with particular advantage for small animals.

Darvall Smooth Wall Tubing (SWT) Circuits  use low resistance, low volume, small diameter tubes. 

This new concept in circuit design offers HUGE efficiency advantages for the patient as well as for your practice.

Features & Benefits:

Smooth Wall Tubing Circuits reduce circuit resistance
Lower resistance means they can be used for smaller patients (as small as 7 pounds)
Smaller diameter tubing reduces gas volume by up to 75%
Reduced circuit volume improves system response to changed anesthetic settings
Size 12 mm can be used as part of a Parallel Lack non-rebreathing system
SWT Circuits are kink-resistant
Easier to clean than the standard corrugated tubing breathing circuits
Dries Quickly and Completely

Darvall Heated Smooth Wall Tubing Rebreathing Circuit - 16mm - for patients > 65 pounds

SWT Heated Circuits Features & Benefits:

Heating wires wound through inspiratory hose

Temperature of delivered gases measured at Y-piece & displayed

Hypothermia risk reduced, particularly in smaller animals

Can be used heated or non-heated

Requires the Darvall Heat Control Unit (#8516) for heated use (sold separately)

Heated Circuits - Reduces Hypothermia, particularly for smaller animals.

Available to the US Market, the first HEATED, temperature-controlled breathing circuit of its kind.  This new heated inflow hose was developed by veterinarians to address the problems of hypothermia in anesthetized veterinary patients.  Our breathing circuits can be used for all veterinary rebreathing anesthesia, with particular advantage for small animals.

Darvall Smooth Wall Tubing (SWT) Circuits  use low resistance, low volume, small diameter tubes. 

This new concept in circuit design offers HUGE efficiency advantages for the patient as well as for your practice.

Features & Benefits:

Smooth Wall Tubing Circuits reduce circuit resistance
Lower resistance means they can be used for smaller patients
Smaller diameter tubing reduces gas volume by up to 75%
Reduced circuit volume improves system response to changed anesthetic settings
SWT Circuits are kink-resistant
Easier to clean than the standard corrugated tubing breathing circuits
Dries Quickly and Completely