Simplify your plumbing and home improvement projects with the John Guest Polypropylene Service and Repair Kit. John Guest push-fit technology provides a simple, reliable, and leak-free connection. This kit includes a sturdy, compartmentalized organizer box with a fitting identification label. Service and repair kits include FDA-compliant fittings for use in multiple different applications and can withstand a maximum pressure of 150 PSI at 70 degrees F and 60 PSI at 140 F. This durable organizer includes the most popular 1/4 inch, 5/16 inch, and 3/8 inch fittings used for appliance applications.