INFORMATION Recessed Skin Fittings (Thru Hulls)

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PRODUCTINFORMATIONRecessed Skin Fittings (Thru Hulls)Designed and made in New Zealand, TruDesign Skin Fittings (Thru Hulls) are precision moulded from glass-reinforcedNylon composite. Certified to ISO 9093-2 by the International Marine Certification Institute (IMCI, Belgium). Comply with ABYC H-27 standards when used in conjunction with the TruDesign ABYC collar. Certified by Bureau Veritas to ISO 9093-2.TruDesign Skin Fittings (Thru Hulls) eliminate all corrosion and bonding problems associated with electrolysis givingpeace of mind with respect to the safety of your vessel.Features: Low profile for less drag below the water line.Compatible with all hull types – Can be used on aluminium, steel, wood,composite & GRP hulls.Immune to corrosion & electrolysis – No corrosion breakages, increasedsafety.Chemical resistant – Unaffected by diesel, petrol, chemicals, andantifouling paints.U.V resistant – Will not degrade or discolour from the sun’s ultravioletrays.Paintable – Paintable with all types of antifoul including Coppercoat Fits TruDesign Ball Valves and other parallel BSP or NPS threads –Universal compatibility to TRUDESIGN brand fittings and other marinehardware.Large operating range – Suitable for all marine conditions from -40 C to 110 CMeet ABYC H-27 Standard when installed in combination with TruDesignBall Valves & Load Bearing Collars.LEADERS IN MARINE COMPOSITEFITTINGSWeb: www.trudesignplastics.comPage 1 of 7REV D

PRODUCTINFORMATIONPart Numbers BSPPart 091129Part 391135SKIN FITTINGS / THRU HULLS - RECESSEDSkin Fitting Recessed ½” BSPPKGSkin Fitting Recessed ½” BSPTaggedSkin Fitting Recessed ¾” BSPPKGSkin Fitting Recessed ¾” BSPTaggedSkin Fitting Recessed 1” BSPPKGSkin Fitting Recessed 1” BSPTaggedSkin Fitting Recessed 1¼” BSPPKGSkin Fitting Recessed 1¼” BSPTaggedSkin Fitting Recessed 1½” BSPPKGSkin Fitting Recessed 1½” BSPTaggedPart Numbers NPSPart #Black9123791238912399124091241LEADERS IN MARINE COMPOSITEFITTINGSPart #White9124291243912449124591246SKIN FITTINGS / THRU HULLS - RECESSEDThru-hull Recessed ½" NPSThru-hull Recessed ¾" NPSThru-hull Recessed 1" NPSThru-hull Recessed 1¼" NPSThru-hull Recessed 1½" NPSWeb: www.trudesignplastics.comPage 2 of 7REV D

"1½"BCDEFThread LengthOverall LengthHead DiameterCutout DiameterHex Size 34mm42mm48mm67mm66mm66mm85mm84mm2 2/3''2 4/7''2 4/7''3 1/3''3 1/3''2 3/4''2 3/4''2 3/4''3 1/2''3 1/2''Dimensions All dimensions in millimetres.LEADERS IN MARINE COMPOSITEFITTINGS1 1/4''1 2/3''2"2 1/2''3 1/7''6/7''1"1 1/3''1 2/3''1 8/9''28mm34mm42mm52mm60mmG1 1/9''1 1/3''1 2/3''2"2 1/3''Minimum InternalØ12mm1/2''17mm2/3''23mm1"30mm1 1/5''36mm1 2/5''All dimensions nominal.Web: www.trudesignplastics.comPage 3 of 7REV D

PRODUCTINFORMATIONMaximum Hull Thickness:SizeMaximum Hull Thickness allowing 70%thread engagement into Ball Valve½” BSP36mm¾” BSP36mm1” BSP36mm1¼” BSP49mm1½” BSP49mmNote; it is recommended for very thin hulls that a backing plate be added to make the “effective hull thickness” aminimum of 20mm.Standards & Approvals:.ISO 9093-2 Standard requirements.ABYC H-27 Standard requirements. In accordance with ISO 9093-2 standards,Skin Fittings (Thru Hulls) are subjected to a155kg (341.7lb) load, applied to thethreaded section for a minimum of 30seconds, without any damage occurring.TruDesign Skin Fittings (Thru Hulls) meetthis standard.Note: ½” size Skin Fitting (Thru Hulls) arenot approved to ISO 9093-2 or ABYC unlessused with an ABYC collar.LEADERS IN MARINE COMPOSITEFITTINGSTruDesign Skin Fittings (Thru Hulls), whenassembled together with TruDesign BallValves and Load Bearing Collars, complywith ABYC H-27 standards. This allows theentire assembly to withstand a 500lb(226.8kg) load applied to the inboard endof the assembly (i.e. from the Ball Valve’sTail fitting) for a minimum of 30 secondswithout any damage occurringWeb: www.trudesignplastics.comPage 4 of 7REV D

PRODUCTINFORMATIONInstallation: Location & Drilling Ensure there is sufficient room on the inside of the boat to allow the Ball Valve to be screwed on withouthitting the bulkhead or other part of the hull and will not cause the valve handle to be knocked open orclosed. Note; A “T” handle Ball Valve is available for smaller area locationsDrill from the inside a pilot hole 3mm in diameter, then drill from the outside of the hull a recess that is 1mmlarger in diameter than the flanged head of the chosen Skin Fitting. Only drill deep enough to allow theflange of the Skin Fitting to sit in the recess flush with the outside of the hull. A hole-saw can be used to cutthe recess and a chisel used to remove the material.Making the skin fitting hole. Drill through the centre a hole that is 1mm larger in diameter than the outsidediameter of the thread of the chosen Skin Fitting. A packer may be required to provide a stronger and flatsurface for the nut and washer on the inside of the hull. For very thin hulls a backing plate needs to be addedto make the “effective hull thickness” a minimum of 20mm.It is recommended to “dry fit” the Ball Valve Skin fitting assembly and then trim the skin fitting (with ahacksaw) to allow a 2mm to 5mm gap between Skin Fitting Nut and Ball Valve to minimise overhang.Too Much Gap between Skin Fitting Nut and Ball ValveCorrect amount of gap between nut and Ball Valve TruDesign Skin Fittings (Thru Hull) are suitable for installation in all types of hull construction; steel,aluminium, composite, fibreglass – cored and solid, wood, wooden sandwich and caulked solid wood hulls.Ensure fittings are always installed in the centre of individual planks For boat builders of GRP and vacuum moulded hulls a disposable mould plug is available that automatically“shapes” the hull to the recess of the skin fitting and provide a location centre hole – See separateinformation sheet. – GRP Mould PlugsL E A D E R S I N M A RI N E CO M PO SI T E FI T T I NG Swww.trudesignplastics.com Rev E

PRODUCTINFORMATIONRecommended Hull Adhesive Sealants & Glues.First clean all surfaces to be bonded with a general-purpose cleaner. 3M Marine Adhesive Sealant Fast Cure 5200. A one-part polyurethane adhesive/sealant. Starts to cure(tack-free) in approximately 2 hours, after which hoses can be attached. Full cure takes 24 hours – refer tomanufacturer’s product literature. SIKAFLEX 291i Marine Sealant. A one-part polyurethane adhesive/sealant. Starts to cure (tack-free) inapprox. 2 hours, after which hoses can be attached. Full cure takes 24 hours – refer to manufacturer’sproduct literature. Bostik 920 Marine Sealant. A one-part urethane adhesive/sealant. Starts to cure (tack-free) in approx. 2hours, after which hoses can be attached. Full cure takes 1.5 – 3 days – refer to manufacturer’s productliterature. West System (or similar) two-pot epoxy that mixes to a paste. Tip – adding filler to the West System willincrease the viscosity and help minimise “running” of the epoxy. Visit / for more details.Fitting & Sealing Smear the adhesive or glue on the underside of the Skin Fitting (Thru Hull) flange and a small way up thethread, but no further than the thickness of the hull. It is important not to have any adhesive on the exposedthread area as this could prevent the Nut or Ball Valve from turning.Insert the Skin Fitting (Thru Hull) through the hull from the outside. Note The TruDesign Skin FittingInstallation Tool enables our skin fittings to be installed by one person saving time and money. See separateinformation sheet on our web site.If necessary, place two strips of masking tape over the flange and attach to the hull to temporarily hold inplace. Go inside the hull to fit the Nut. Note it is good practice to have a backing plate to spread the loadespecially if there is excessive curvature in the hull or the hull is very thin.Hold the thread down near the washer and screw on the Nut. Once the nut is screwed down far enough thatyou can hold the fitting above the nut do so and continue to screw the nut down onto the washer ensuring itis only finger tight.On the outside of the hull clean off any excess adhesive. Tip – use an angled tool or putty knife to ‘blend’adhesive around the Skin Fitting (Thru Hull) flange and the hull so it is easier to clean when sanding andantifouling in the future.After recommended curing times, tighten the nut to no more than 15 ft / lb. There is no need to over-tightenthe Nut, especially if epoxy has been used, as the Skin Fitting (Thru Hull) is now an integral part of the hull.L E A D E R S I N M A RI N E CO M PO SI T E FI T T I NG Swww.trudesignplastics.com Rev E

PRODUCTINFORMATIONThread Sealing All the sealants mentioned above under “Hull Adhesives” can be used for thread sealing. These adhesivesealants allow the Ball valve to be “set in position” to suit handle operation with no risk of turning when inuse. If in the unlikely event the Ball Valve has to be removed this will require significant force.3M Marine Adhesive Sealant Fast Cure 4200 is approximately half the strength (once cured) of 3M 5200which allows for eventual disassembly of the ball valve from skin fitting.LOCTITE 5331 A one-part acetoxy silicone sealant. Starts to cure (tack-free) in approx. 10 minutes, afterwhich hoses can be attached. Full cure is achieved within 12 hours (at min. 40% atmospheric humidity) –refer to product literature. Creates a permanent seal for threaded connections.PTFE (Teflon) Thread Tape is a traditional thread sealing method which provides a good seal when appliedcorrectly. However, in some cases if the position or tightness of the Ball Valve is incorrect, it will need to beunscrewed and more tape applied, slowing the assembly process. Additionally, the fittings can sometimes beturned by hand after being installed.LOCTITE 55 Pipe Sealing Cord is a coated multi-filament cord designed as a faster method than Teflon tapeto seal threaded fittings. The main advantage is that a component, for example a Ball Valve, could bescrewed down then screwed back a turn to suit positioning whilst still maintaining a tight seal. Thiseliminates the need to remove the entire Ball Valve and apply more tape as with traditional Teflon tape.TruDesign Skin Fittings (Thru Hulls) are printed and marked with the following information.Engraved ‘B’ for BSP thread, or‘N’ for NPS threadTruDesign brand is printed on the nut. Thisenables clear identification that genuinefittings are installed.L E A D E R S I N M A RI N E CO M PO SI T E FI T T I NG Swww.trudesignplastics.com Rev E

TruDesign Skin Fittings (Thru Hulls) eliminate all corrosion and bonding problems associated with electrolysis giving . TruDesign Skin Fittings (Thru Hull) are suitable for installation in all types of hull construction; steel, . (Thru Hull) through the hull

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