Giant filter housings offer the following unique features: -Head and sump threads incorporate Keystone's exclusive positive stop feature to prevent overtightening. -O-ring is securely retained in groove at top of bowl so that is stays in place even during cartridge replacement. -Custom colors available by special order. - Mounting bosses in head for available bracket. -Full testing to industry standards of the Water Quality Association for burst pressure, water tightness and fatigue resistance. -FDA grade material for potable water.
