Jet Thruster Technical Manuals

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Before you start:  Quick Start manual - select your language

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When you have a question about installation, maintenance or repair:

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Informative video's

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Frequently Asked Questions: Composite parts

  • Which sealant can I use on the threads ?

    Sikaflex 291i, Wurth Marine Sealant 


    - Prior to aplying Sealant, clean all threads with Break-cleaner or Acetone. Clean the Male and Female sections


    - Apply sufficient Sealent to the full thread surface. smear sealant into the threads and provide a smooth surface. Apply sika to the tread section of both parts which are joined together!


    - Direcly after joining them, fully turn the parts untill they reach the end of the thread. Especially for the 3" and 4" parts this will go smooth but will require some muscle power. 


    - First: Use paper towel to remove most of the exsessive, spilled sealant. 


    - Second: Use the Wet-Wipe towles to remove the remaining seanet. Rub the parts thoroughly, the wet-wipe will fully remove the excessive sealant. There wil be no sign of the excessive sealand anymore. 


    - The PU sealant with cure very fast in high temperature, high humid enveronments. Work methodically and fast, there is a approx 15-minute window, before the sealat will cure





  • Are the composite parts approved / compliant to international standards?

    Yes, all our composite parts are ISO9093-2 and ABYC certified, and approved by the Notified Body, Dutch Certification Institute. All Composite parts have been designed to meet the highest standards and have a very high strenght. Certificatations are available

  • Can I screw a tapered fitting to a composite part?

    Not possible! Our composite parts are BSP parallel threaded. NPT to BSP thread will cause problems. 

  • Can I cut a composite thread to lenght?

    Yes, no problem. Just make sure to keep sufficient thread for the part you connect to it

  • Can I paint the flanges of the nozzles with Anti-fouling?

    Yes, No problem

  • Do the composite Ball Valves require lubrication ?

    We make use of very high quality Composite ball valves which meets the highest standards. The following recommendation applies:


    No, Ball valves are manufacturerd with a Teflon impregnated ball running on teflon rings. No lubrication is required. Turn the handle every few months to keep the movement free

  • Why are there Stainless steel parts in the JT system?

    Jet Thruster systems make use of a variety of straight threaded fittings. Composite parst are corrosion resitant. All stainless parts in the system are bonded to a Sactificial anode present in the pump inlet section. The anode is easy to inspect and change without the need taking the boat out the water. 

  • Is composite strong enough?

    When designing our parts, product safety is our highest priority. This is not a hollow frase. Our composite parts are injection moulded from a Top Quality Dupont Composite substrate. After the design stage a demanding test stage follows in which the parts are tested to the limit. An independed Notified Body certified our products after testing them according to the Norms to which these part must comply. Composites simply enable great maritime products, no wonder allmost every boat builder these days is switching from metal thru hulls into Composite equivalents.