Used on air removal assembly 3257048 f100cl(10001); elek eqpt water cooler hd-1077/ssq ddg91&up; air removal assembly 3257048 ddg91&up (10001); elek eqpt water cooler hd-1157/spy ddg91&up. o-ring union union end coupling seal, 0.375 globe stop check valve 4820-01-154-6275