Water Tank access ports

[Mack8964]

Is it possible to add access ports to plastic water tanks? I have two tanks with tiny 1 inch openings that look welded shut and one with a ~ 4" opening that is also welded shut (see pics). I took them out last weekend and cleaned what looked and smelled like a grade school science project gone bad. I'd just like to be able to get inside with a scrub pad to finish the job. During removal I discovered the v-berth tank grey supply line was loose and fell off before I took the tank out. At least I know where the water was coming from.

 

[Frank Langer]

Is it possible to add access ports to plastic water tanks? I have two tanks with tiny 1 inch openings that look welded shut and one with a ~ 4" opening that is also welded shut (see pics). I took them out last weekend and cleaned what looked and smelled like a grade school science project gone bad. I'd just like to be able to get inside with a scrub pad to finish the job. During removal I discovered the v-berth tank grey supply line was loose and fell off before I took the tank out. At least I know where the water was coming from.

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Yes, we have inspection ports in both our water tanks. They are Ronco plastic tanks, with a plastic cover like you see in chandleries, with the plastic frame screwed in place and sealed with Silicone. Doesn't leak, and allows cleaning with a sponge or rag.
Frank

 

[wynkoop]

I have a single access port in the top of Silver Maiden's water tank. In fact that is how the water gets in the tank. Ericson put no deck fill on the E27.

I think my port is a 4 inch, but any reasonable size should be fine in the top of your tank.

 

[Loren Beach]

You might call Ronco (builders of most of these 'plastic' tanks) and ask them about "Spin Welding" in a 6 inch inspection port. This process actually melts the plastic around the fitting and permanently welds it to the surface. They might know of a local vendor that could save you shipping costs, or at least give you a quote for doing the work. They have been really helpful every time I have called them or sent in a question.
They have gotten good references from Ericson folks here for 20 years.

Boat Tanks – Ronco Plastics

Ronco Plastics is a leading manufacturer of Boat tanks of various gallon capacity and dimension. Visit now for more information!

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[Mack8964]

Thank you all. I ordered some today.