Schedule 80 CPVC Couplings The 9830-131 1" x 3/4" Schedule 80 CPVC Reducing Coupling is made of durable, industry approved CPVC material. These fittings are used in a variety of CPVC applications around the world and are molded with a smooth interior wall resulting in less pressure loss and higher volume than conventional metal fittings. Size: 1" x 3/4" Schedule: 80 Material: CPVC End Type: FPT x FPT Max Operating Temperature: 200 deg. F Standards/Listings: ASTM D 1784, NSF for potable water services