These corrugated tubes are made of stainless steel or copper and are named as stainless corrugated tube,metal bellows,stainless flexible tube or metal hose.

Dong-A’s stainless steel corrugated tubes, which is approved by UL(USA), RWTUV(Germany) and is certified as quality products with NET, KS(KSD3628) by the Korean government, are supplied in a roll up to 1,200m and used for water piping system inside buildings. The corrugation pitch is slightly wider to reduce the fluid resistance and thus generate no vibration or noise. It connects with screw-in-field type of fitting with cone packing (NBR, E.P.D.M, Silicon, Graphite).

Dong-A’s stainless steel corrugated tubes, which are approved by UL(USA), RWTUV(Germany) and are certified as quality products with NET, KS(KSD3628) by the Korean government, are supplied in a roll up to 1,200m for easy speedy inexpensive installation. As no connecting point exists on the tubes except both ends of the tube, there is no fear of leakage. The screw-in type connection with NBR, EPDM, Silicon, or Copper packing doesn’t require any tool for installation.

Dong-A’s stainless steel flexible hose for gas system, which is approved by UPC(USA ANSI), CSA (CANADA) and is certified as quality products with NET, KS(KSD3625) uniquely by the Korean government, is supplied in endless role type and gas connector type. Corrugated Stainless Steel Tube (CSST ANSI LC 1a), which is coated with ultraviolet resistant & non-flammable synthetic resin, is internationally certified piping material to be buried inside buildings. As it is supplied in a set with its own fittings, it is the best gas piping material to be used safely and semi-permanently

Endless roll type of helical type corrugated tube, which is approved by UL(USA), RWTUV(Germany) and is certified only as a quality product with NET, KS(KSD3628) by the Korean government, is the ideal product for a heat exchanger.

The corrugated tube which is approved by UPC(USA), ANSI(American standard), CSA(Canadian standard), RWTUV(Germany) and is quality certified as new technology (NET) by Korean government. In order to manufacture gas connector (AISI 221.24) as metal joint type, it is offered with swaging on both ends of annular type stainless steel flexible tube & flare type or flare type metal joint connector.

Conventional sprinkler joints have more than 6 spots of jointing with the risk of water leakage as their elbow and reducer are assembled and connected after screw processing is done on the tips of the both sides of a steel pipe. It is quite hard to adjust location of the sprinkler head up or down or right or left. Also, installation of the equipment on the narrow ceiling requires high-skilled construction workers and long time due to the obstacles of the structure such as air-cooling, heating ducts, electricity and communications facilities.

Superiority
We are using AISI 304 or 316L pipe (stainless steel pipe for the general piping with KSD 3595) which are excellent for durability and corrosion resistance in order to form the corrugation and then we perform the heat-treatment solution.
So they are the best hygienic piping materials.

Our helical corrugated tube for Solar Thermal system is approved by UL(USA), RwTuv(Germany), NET(New Excellent Technology in Korea) & KS(Korea Standard), which means product quality is approved with reliability.