RIDGID 38178 HB-383 Seal. RIDGID's HB Series Hydraulic Benders are designed for cold bending of standard gas pipe to the precise degree without compromising pipe durability. These Benders have the capability to bend pipe up to 4 inches in diameter. These Benders are ideal for commercial and residential applications. The RIDGID 38178 HB-383 Seal is genuine replacement part manufactured by RIDGID and is specifically designed for HB-383 Hydraulic Benders. This RIDGID 38178 HB-383 Seal is fully covered under RIDGID's 3-year limited performance warranty and lifetime warranty to be free of material defects.