Image Products At John Guest®, our products exceed industry standards while upholding the utmost quality. Image OD Tube Fittings (5/32 — 1/2 in.) A robust selection of inch- and metric-sized push-fit 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 Kit options for both installation and servicing. Image LLDPE Tubing Robust, versatile plastic tubing for various applications. Image CTS Fittings (3/8 — 1 in.) Advanced technologies for CTS 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.