- Action: To Do Lis item A0080 – Obtain 1 1/2 inch marine rated hose and clamps.
- Action: To Do List item A0081 – Remove, clean-up, add backing plate, reinstall, and reseal the galley sink discharge 1 1/4 inch thru hull.
- Completed: A0080 - 10 July 2015. A0081 - 24 April 2017
- Cost: $303.80
The galley sink discharge non-marine rated hose was attached to a thru hull that was also the heat exchanger for the Isotherm 3751 ASU SP sea water cooled refrigeration system aboard. No seacock was installed for this under the water line location, which is one of the primary reasons for this To Do List action item. The need to remove and reseal this thru hull was a result of a failed attempt to tighten a NPT (National Pipe Thread) threaded seacock on the BSP (British Standard Pipe) threaded thru hull - see further story here. This failed attempt resulted in the thru hull turning and most likely breaking the seal the old sealant provided.
A pictorial diagram depicting the complete system was created to identify and illustrated the parts and material needed.
The following items were ordered and received mostly by ocean freight shipment.
| P/N | Item | Q | Each | Total |
| 405726 | Maestrini Bronze Body Ball Valve 1.25" BSP Female Stainless Steel Handle | 1 | $62.40 | $62.40 |
| 435066 | Maestrini DZR Straight Hose Tail (1-1/4" BSP Male to 38mm Hose) | 1 | $12.93 | $12.93 |
| -- DHL 3 to 4 Day Shipping | $47.45 | |||
| -- Philippines Duty and Customs Fees | $38.04 | |||
| IBV-1250 | Groco IBV Series Full Flow Inline Ball Valve Thread Size: 1-1/4" Female NPT | 1 | $49.49 | $49.49 |
| FF-1250 | Groco FF-Series Straight Full Flow Pipe to Hose Adapter 1-1/4" NPT x 1-1/2" ID Hose | 1 | $17.99 | $17.99 |
| SBE00006AA | Isotherm SP Refrigeration System Replacement Zinc Anode | 1 | $26.99 | $26.99 |
| 134-112 | Trident Heavy Duty Engine Intake Water & Heater Hose - 1-1/2 Inches | 5 | $7.19 | $35.95 |
| 316064 | AWAB Marine Grade Hose Clamps SAE Size: 32 Clamping Range: 1-1/2" - 2-1/2" | 4 | $3.14 | $12.56 |
| $303.80 |
Explanations: The Groco ball valve and hose adapter were ordered but the incorrect part as their threads did not match the Isotherm BSP (British Standard Pipe) threaded thru hull. Not included in these costs were the thread sealant, 3M Marine Adhesive Sealant 4200, or the Interlux InterProtect HS Epoxy Primer (YPA422 / YPA420) paint as the cost of these were accounted elsewhere.
The kinked non-marine rated hose and rusted clamps were removed and discarded. Next the attempts to back off the retaining brass nut on the thru hull were extremely difficult. A spanner wrench was used with no success. Then a pipe wrench was held on the large brass nut while the movement of the wrench was performed by a partner resulting in it finally breaking loose. A drill with wire wheel attachment was used to clear the threads of the residue sealant and contaminants, and finally the brass nut was clear and off. The brass thru hull was gently pressed down and out without damage to the delicate refrigeration heat exchanger lines enabling the removal of the old sealant. The old sealant was removed from the hull hole area using razor blades.
The exterior and interior surfaces were sanded with 80 grit sandpaper and the area wiped clean. Two coats of Interlux InterProtect HS Epoxy Primer (YPA422 / YPA420) were applied to the exterior and interior surfaces and allowed to cure dry. The Maestrini Bronze Body Ball Valve threaded easily and fully down onto the Isotherm thru hull - definitely is easier to join two threaded items when the threads (1.25 inch BSP) are of matching type. All the items were reinstalled, dry-fitted, to verify fit and alignment, before final installation with the application of sealant.
The Isotherm 3751 ASU SP thru hull had 3M 4200 Marine adhesive sealant applied and the internal bronze nut was fully tightened down. The new hose barb and seacock threads had Teflon sealant tape applied and were then assembled together. This was then screwed onto the thru hull flange fully tight while making sure there was no movement against the hull of the thru assembly.
