Are all Symmons shower valves the same?

No, not all Symmons shower valves are the same, Symmons makes several different lines of shower valves with different features, though they all share the core Temptrol pressure-balancing technology that Symmons invented. Symmons Industries, founded in 1939 in Braintree, Massachusetts, makes the original Temptrol pressure-balancing valve introduced in the 1960s, which is its most famous and most durable, using a spindle and piston design that lasts 30 to 50 years and is rebuildable, costing $100 to $200. Symmons also makes the Allura line, which is a more modern, sleeker trim with pressure-balancing and thermostatic options, costing $150 to $300. Symmons Dia and Duro lines offer different handle styles and flow rates. Symmons also makes Symmons Origins and Elm valves that combine with its faucets. All Symmons valves use Temptrol technology for scald prevention, but differences include pressure-balancing only versus pressure-balancing plus thermostatic, flow rates of 1.5 to 2.5 GPM, connection types, and trim styles from commercial institutional to residential modern. Some Symmons valves are for commercial use with vandal-resistant features for schools and prisons, while others are residential. So while core pressure-balancing mechanism is similar, trim, features, flow rates, and applications differ, so not all Symmons shower valves are the same, though all are durable and made in USA.