SF Series Caps for Split-Flange Connections SF Series caps protect four-bolt split-flange connections. The caps are manufactured with natural, translucent polyethylene and push on with an internal bead for a positive locking grip. The O-ring remains visible after closure is applied. Material: Low-Density Polyethylene Color: Natural A B HSF Series High-Pressure Split-Flange Covers HSF Series high-pressure split-flange covers are designed with translucent low-density polyethylene to protect four-bolt split-flange connections. The covers attach easily with an internal bead that provides a positive locking grip. The O-ring remains visible after closure is applied. Material: Low-Density Polyethylene Color: Natural A .03 B SFP Series Covers for Split-Flange Connections SFP Series covers for split-flange connections are used on SAE 3000 lb., four-bolt split hydraulic flanges. The covers protect port and flange surfaces by fitting securely into opening. Material: Low-Density Polyethylene Color: Red 386 * For other material and color options, contact customer service.