Flanged Tri Clover Compatible tri clamp gaskets have a small flange around the circumference of the gasket, holding it in place on one of the two fittings.  This allows for a much easier overall operation. EPDM offers a wide temperature operating range while maintaining flexibility and good resistance to cleaning chemicals. 

Specifications:

Manufacturer: Rubber Fab Technologies

Material: EPDM

Temperature Range: -20F to 300F

Inside Diameter: 1-3/8"