*** Please allow up to three weeks for delivery ***
The Petsafe 940US Staywell Tunnel Extension for 900 Series is used with the 919 4-way locking cat flap only (model 919US). Tunnel sections may be stacked to convert the 919 into a 'self-framing' pet door to any thickness. Tunnel sections are 7/8 inch thick. Use as many as necessary for your particular application.
DISCLAIMER: The results described on the testimonials on this site, are the individual experiences and personal opinions of those who have purchased and used the products. These testimonials are not intended to make any claims that the products can be used to diagnose, treat, mitigate, cure or prevent any disease or medical condition.