Design with sleeve on a shaft enables seal applications with higher P-v values. BT-TNG type can be used in all standard applications and it is reccommended for fluids containing solid particles and/or higghly viscous liquids. This seal type is first choice for sealing LPG. Combination of seal face materials is designed for working condition and pumping media. Secondary sealing by O-ring. Other construction parts are made of stainless steel.