Hydraulic Cap for oil cooler  Product Description These caps are made especially for all kind of oil heat exchangers . Hydraulic oil cooler will undertake a high pulse  pressure when machine starts  ,if  can not install a bypass oil valve ,possibly coolers will be bursted . diffierent caps will be design and manufatured with diffierent pressure setting  . it can be cusomized for you. Applications Engineering machinery  and air compressor  OUR SERVICE: Provide the technical design and solutions; For small order ,we deliver in one day only (because we have stock) . We will arrange courier or sea shipment as your advise in time . Supply fittings at any time too; QUALITY ASSURANCE Strict contract auditing invloved all departments to assure the feasibility of each order. Process design and validation before bulk production. Inspection for each process ,worker self check too . Each cooler with pressure test according to request . Strictly control on all raw materials and final inspection before delivery