SS-350 Stainless Steel Flexible Coupling is designed for low pressure MF/UF/RO systems.It is made of CF8(304) or CF8M(316) with 304 or 316 bolts and nuts.
Size-Inches/DN: 
3/4" to 8" (DN20 to DN200)
Rated working pressure: 
350psi(25bar)cut groove only
Housings:Type 304 Stainless steel to ASTM A351 CF8 or A743 Gr . Cf8Type 316 to ASTM A743 CF8MType 316L to ASTM A743 CF3MDuplex 2205 to ASTM A890 4ASuper Duplex to ASTM A890 5ADuplex 254SMO to ASTM A351 CK3McuN.
Rubber Gaskets:
The gasket seals is C-shaped, made of standard gasket EPDM(ethylene propylene diene monomer) for cold water , hot water , rare acid, oil-free air and multiple chemical product (-50~150 ).It is not suitable for medium like petroleum.
Bolts & Nuts:Round-head, elliptoid-neck, carriage bolts,type 304 stainless steel bolts and heavy dutynuts conform to ASTM F-593Type 316 stainless steel bolts and heavy duty nuts conform to ASTM F-593