Image Products At John Guest®, our products exceed industry standards while upholding the utmost quality. Image OD Tube Fittings (5/32 — 1/2 in.) John Guest has a robust selection of inch- and metric-sized push-fit tube fittings for applications ranging from food quality and vending to pneumatics and agriculture. Image OD Valves (1/4 — 1/2 in.) Polypropylene and acetal valves for water filtration and beverage applications. Image Installation Kits Polypropylene fitting kits with options for both installation and service. Image LLDPE Tubing Robust, versatile poly tubing for various applications. Image CTS Fittings (3/8 — 1 in.) Advanced technologies for copper tube-size fittings and plumbing installations. Image CTS Valves (1/2 — 3/4 in.) Reduce installation times with ProLock and Speedfit CTS valves. Image SharkBite PEX Pipe Durable, flexible cross-linked polyethylene tubing. Image OEM Solutions OEM half cartridges for a variety of applications.