The Riobel 291048 2-way Type T/P (thermostatic/pressure balance) coaxial valve trim is a precision-made valve trim that is designed to provide accurate temperature and pressure control in your system. This valve trim is made from high-quality materials and is designed to last for years of use. The Riobel 291048 2-way Type T/P (thermostatic/pressure balance) coaxial valve trim is a precision-made valve trim that is designed to provide accurate temperature and pressure control in your system. This valve trim is made from high-quality materials and is designed to last for years of use.