PVC TUFF GUARD™ Gauge Isolators (Also known as Gauge Guards, Diaphragm Seals)Viton® Diaphragm, 1/4" Vent (Viton® O-Ring) Vent Fem NPT Instrument (Viton® O-Ring) x 1/4" Solvent Soc Inlet Process, Protects and Isolates Pressure Sensing Instruments