New 6" O-ring made of Buna rubber. Fits on these pumps: 3656S, 3756S, 3656M, 3756M, 3888D3, 38883SD, 3888D4, 38884SD. Trustworthy factory part from Goulds.
Replace a cracked, worn, or snapped O-ring with this OEM part. The Goulds 5K74 O-Ring has a 6" diameter and is made of Buna-N rubber. Confirm compatibility by checking your pump manual.