Teflon PTFE 1.5" Tri Clamp Filter Screen Gasket 316L Stainless Steel 20Uf Micron. Gasket material approved by (3A), USDA and complies with FDA's 21CFR177.2600 and 1550. PSI Service Ratings for the sanitary clamps DO NOT APPLY to connections (1" and above) using any PTFE gaskets, due to the potential for cold flow under normal operating conditions. PTFE gaskets, when used with any clamp, are likely to leak at pressures far below the published service ratings. This restriction does not apply to the fractionally sized 1⁄2" and 3⁄4" connections, due to their recessed, fully contained design. color code: no dot 
 meets 21CFR 177.1550 
 passed U.S.P. Class VI Cytotoxicity testing 
 not recommended for use with bolted clamps