A high specification hole seal made up of four separate parts when the main seal is used for the SPF hole. This design optimizes the mounting groove size of the piston. The special PTFE resin material can avoid the crawling problem of the sealing ring under the U-ring structure. The needle's compression resistance to SPS was insufficient, and special nylon rings were added on both sides of the resin to increase durability. The NBR rubber at the bottom is the force applicator, providing the support required for the sealing system and can be used at lower temperatures than the SPW.