Seacocks are required to shut off the flow of seawater supplied via a throughhull fitting to onboard equipment, including engines, gensets, livewells, airconditioners and the head. For flush head thru hull fittings only, make an external 45 deg. They are straight threaded nps thread so they can be cut to the correct length, for your hulls thickness, and then be threaded into a female straight threaded seacock or a flanged adapter. Despite this leaks are very common and can be found on new boats and old boats alike. Given this fact it is surprising how little care most boat owners give to this important hardware. As part of your boats routine maintenance, tapered plug seacocks. The design, material selection, and installation of this equipment is of paramount importance. We consider either method acceptable, as both represent a safe and secure installation. Discussion in carver yacht started by jnicholas, jul 24, 2016. Duncan kent explains what you should look for in these vital fittings clearly, with any device that penetrates the hull of a yacht, the choice of. Most through hull fittings have two ridges inside the pipe that allow.
Ulube is injected through a zerk fitting, standard on groco valves beginning 2016, into the cavity between the valve body and the ball while the valve is in the open position see figure1. Autopilots communications computers software fishfinders. Its not a problem to pull the transducer and insert the stopper plug from inside you get a few seconds flow. One, how long has it been since you hauled the boat for this maintenance.
As a general rule, a boat whose gunwale is close to the water low freeboard has a greater chance of sinking accidentally. Choosing throughhull fittings of the highest standard and fitting them securely, is essential for peace of mind when out on the water. The cross section of a threaded thruhull fitting very thin. Polypropylene is uv stabilized to provide longevity. Prepare a clean round hole in the desired location and of the appropriate diameter for the chosen thru hull fitting per the requirements below. Dripper guard prevents boat hull stains caused by boat thruhulls. Tucked away in the dim recesses of your bilge, seacocks typically dont get a second thought with regards to preventative maintenance or inspections until they fail to. We carry thru hull connectors, thru hull fittings, thru hull connectors with scuppers, mushroom head thru hulls, and 90degree elbow through hull fittings in a range of diameters and sizes. Wood blocks tend to get soft with age in wet areas. Search through overtons for a great selection of thruhull fittings for your boat, available today. We carry thru hulls from perko, rule, forespar, groco, wilcoxcrittenden, in molded plastic, stainless steel, and bronze. Knowing that bonding system is working is good for peace of mind and more. Impeller shaft hull holes often increase in size with wear. Ss40018bt please enter or update the user part number and a comment.
This item is called a thru hull or sometimes a mushroomhead or even a skin fitting. Like the canary in the coal mine, through hulls can warn you about potentially lifethreatening ac electrical leaks, damaging stray current corrosion, bonding issues, and sacrificial anode problems. Or, is your leak between the thru hull and the hull itself. Through hulls are used to expel waste water, such as from a sink, to let sea water in, such as for engine cooling, and to allow placement of. There are three mounting options for the side imaging transducer. Since 1968, west marine has grown to over 250 local stores, with knowledgeable associates happy to assist. Options to seal the hole after removing a thruhull. Dimensions are for the hose bard size which matches your hose inside dimension. Installing an inline valve onto an nps thruhull fitting creates. However, every good mariner should be prepared for the worst case scenario. Two, the last time you painted, did you paint with antifouling paint up inside the through hull fitting. Your boat will thank you with better performance and improved reliability. Designed of soft rubber for flexibility, uv protected for durability and can be installed.
Ball valve assemblies and underwater skin fittings. Through hull fittings like sink drains and seacocks fall into a group of components that can make the difference between floating your boat and getting that sinking feeling. The marelon plumbing system for power and sailboats is a very complete line of marinegrade seacocks, valves, thru hulls and related fittings. Marine caulking products guide will help you understand the difference and properties of the caulking options available and where to use the.
But bronze through hull fittings offer a surprising and important window into the condition of your boats electrical system. Perkos thru hull scupper designed for mounting through transom. Now that its begun to leak, i can no longer ignore it. I have found more often than not, when a failure occurs. All thruhull fittings below the heeled waterline of a vessel must be. Leaks can be just annoying, or cause structural damage and even lead to sinking. For a single skin hull, one that is not cored, grind a circular dish shaped area into both sides of the hull. Threaded thru hull connector with a mushroom head and barbed tailpipe ideal for hose connections. Stainless steel swagelok tube fitting, boredthrough male. This definition of thruhulls is straight from the american boat and yacht council. The thru hull fitting on the right has already been cut to length. It is a 38 hole in the hull with a barbed end on the fitting. For nearly thirty years, these products have provided unmatched reliability to marine chandleries, boat yards and the worlds leading boat builders. The thru hull to sea water strainer assembly serves the critical task of providing coolant water to many onboard devices like engines, generators and air conditioning systems.
This article is specific to an intake for a ballast system, but the same procedure can be applied for any hardware that is installed in the boats hull. We change out all of the zincs that need replacing, clean all through hull fittings, inspect all running gear and the bottom of the boat for water intrusion. I would like my livewell to have its own pickup so it does not rely on the washdown system for water. All it takes is a tool box or other large or somewhat heavy item to slam into the valve and snap the thruhull off to sink your boat. What are the mounting options for the various side imaging. Because of the threads cut into it, and the fullflow design, it becomes easier for it to break off.
Featuring discount prices on parts from brands like perko, flowrite, plasform, southco, th marine, and many more names you know, great lakes skipper is the. It is a complete system including thru hull fitting, valve body, and hose connector. To tighten the nuts, with only one person, i find it much easier to use an impact driver. There are no valves, just cracked plastic through hull fittings. Their strength, light weight and freedom from corrosion and electrolysis make this flush head thru hull connector ideal for use above or below the waterline. Volvo, yanmar, nanni, mercruiser inboards, and mercury and yamaha outboard engines, spares and repairs are catered for in our dedicated engineering workshop. Cut a hole through the hull and backing block slightly larger than. Some tapered wooden plugs sized to fit the through hull fittings on your boat. Im looking for options for how the hole im guessing 11. All our music is ed and available to purchase through. These highstrength, highspeed strainers are produced in two piece. Really understanding how her electrical system can damage a boats metal components will help you to avoid costly replacements and repairs. According to boatus, 50% of all boats that sink do so as the result of failed underwater fittings. These steps take software from the ideation phase to delivery.
Top tips for maintaining thruhulls to sea water strainers. We figured it would be beneficial to post a little howto that outlines the process of drilling through the fiberglass hull of the boat, and then installing the thru hull fitting. Most through hull fittings have two ridges inside the pipe that allow you. A thru hull is a fitting designed to accept pipes, hoses, or valves to allow water to pass in or out of a vessel. Find out about the 7 different phases of the sdlc, popular sdlc models, best practices, examples and more. Function, material compatibility, adequate ratings, proper installation, operation, and maintenance are the responsibilities of the system designer and user.
Many of these unnecessary accidents are caused by failed thru hull fittings, seacock valves, sea water strainers or the associated hoses or hose clamps. Marelon products meet and exceed the worlds toughest standards for the. Forget the boat hull cleaner and make your boat maintenance a breeze with dripper guard. The two that im most concerned about are the two below the waterline for intakes the third one is for the drain. All th marine thru hull fittings are made of the highest quality virgin polypropylene to ensure durability and attractive appearance. The thruhull fitting uses a buttress style thread for exceptional strength and each valve is factory assembled and pressure tested. Next time youre hauled or on your trailer, count the holes in your hull and make notes as to their location and function. I also do not want any plastic thru hull fittings below water line. Available in two colors and two sizes for fitting thruhulls up to 2 58 and. To meet iso 90932 the finished product must meet the following strength test, and still function. Checking your through hull fittings is something that is often missed out on when people carry out boat maintenance.
Its threads mate with those of the throughhull fitting, which has nps national pipe straight threads. As part of your boats routine maintenance, tapered plug seacocks should. Marine hoses water, waste, and livewell hoses 112 items. Can you get a new stopper insert for the thru hull fitting hull. A force of at least 1500 n applied a minimum of 10 cycles from a position 20mm off the end of the. Resources drill fiberglass and install thruhull fittings. Well, provided the through hull fitting is independent and has been made from a suitable material, owners can at least upgrade the seacocks themselves. Stainless steel swagelok tube fitting, bored through male connector, 14 in.
The vast majority of all available thruhull fittings have whats referred to as a. These valves are essential components that keep water on the outside of your boat. Forespar marelon plastic seacocks force 4 chandlery. In my experience most yards use fittings made from copperzincnickel alloys, which are sufficiently resistant to electrolytic corrosion. Occasionally, there will be the need to plug a through hole in your hull. Through hull fittings attached through the hull to which a sea cock and hose, a transducer, or other device is attached. Regular inspection and maintenance of through hull fittings should reduce the likely hood of an emergency situation. A ski boat, for example, is more likely to be overcome by rainwater, a slow leak, or a following sea than a cruiser whose impressive hull towers far above the water. The software development life cycle sdlc is a terminology used to explain how software is delivered to a customer in a series if steps. But thats only the beginning of what you should be doing. Improperly maintained thru hull fittings are one of the number one causes of boats sinking so its imperative you inspect them annually for any signs of deterioration. A particularly important part of annual maintenance is inspecting your boat thru hull fittings which allow water and other fluids to pass from the inside or outside of your boat in conjunction with a seacock fitting. Forespar thruhull seavalve installation instructions. Through hull fittings and seacocks below the waterline.