The Delta Trinsic T17T259-SS is a TempAssure 17T Series thermostatic shower trim kit in Brilliance Stainless. Unlike pressure-balance valves that maintain temperature within a range, the TempAssure thermostatic cartridge precisely locks temperature to within plus or minus 1 degree F, regardless of pressure or flow fluctuations elsewhere in the home. A separate volume control handle lets you independently adjust flow. Trinsic's sleek contemporary geometry makes the 17T trim visually indistinguishable from the standard 17-series, but the thermostatic performance is significantly superior. Premium tier. Trim kit only — R10000-UNBX (or R10000-UNBXHF for high-demand systems) rough-in valve sold separately.
What makes TempAssure thermostatic better than a standard pressure-balance valve?
A pressure-balance valve (14 or 17 series) maintains temperature within approximately plus or minus 3.6 degrees F when pressure fluctuates. A TempAssure thermostatic valve uses a wax thermostat element that actively regulates temperature to within plus or minus 1 degree F, regardless of both pressure and incoming water temperature changes. The thermostatic valve reacts to temperature changes directly, not just pressure, making it significantly more precise. It is the preferred choice for spa-style showers, households with fluctuating hot water temperature, or anyone who wants to set a precise temperature and never adjust it.
Does the 17T trim work on the same valve as 14 and 17 series trims?
Yes. The T17T259 trim installs on the same MultiChoice Universal rough-in valve (R10000-UNBX or R10000-UNBXHF). The thermostatic capability comes from the cartridge, which ships with the 17T trim kit. One valve serves all three series — 14, 17, and 17T — which is the core benefit of the MultiChoice Universal system.
Is thermostatic worth the premium price for a residential shower?
For everyday residential use, a standard 14 or 17 series pressure-balance valve is usually sufficient. The TempAssure 17T makes the most sense for: households with long pipe runs where water temperature at the shower fluctuates significantly, spa or steam showers where precise temperature is important for comfort or safety, or homeowners who simply want hotel-grade consistency. The price premium over a 17-series trim is typically $150–$300 depending on finish.
# Delta Trinsic TempAssure 17T Series Thermostatic Shower Trim Kit (Brilliance Stainless) **Model:** `T17T259-SS` **Brand:** Delta **Category:** Shower Trim Kit > The Delta Trinsic T17T259-SS is a TempAssure 17T Series thermostatic shower trim kit in Brilliance Stainless. Unlike pressure-balance valves that maintain temperature within a range, the TempAssure thermostatic cartridge precisely locks temperature to within plus or minus 1 degree F, regardless of pressure or flow fluctuations elsewhere in the home. A separate volume control handle lets you independently adjust flow. Trinsic's sleek contemporary geometry makes the 17T trim visually indistinguishable from the standard 17-series, but the thermostatic performance is significantly superior. Premium tier. Trim kit only — R10000-UNBX (or R10000-UNBXHF for high-demand systems) rough-in valve sold separately. ## Specifications | Attribute | Value | |---|---| | Product Type | Shower Trim Kit | | Collection | Trinsic | | Valve Series | 17T | | Valve Included | No | | Rough In Valve Required | R10000-UNBX | | Function | thermostatic | | Handle Count | 2 | | Diverter | No | | Flow Rate Gpm | 1.75 | | Finish | Brilliance Stainless | | Finish Code | SS | | Watersense | Yes | | Ada Compliant | Yes | | Temp Accuracy Deg F | 1 | | Warranty | Lifetime limited | ## What's Included - thermostatic temperature handle - volume control handle - escutcheon plate - TempAssure thermostatic cartridge Source: https://www.jaspecs.com/delta/shower-trim-kit/t17t259-ss-delta-trinsic-tempassure-thermostatic-shower-trim-kit/