I have tried to open the red plastic inspection ports on the blue plastic water tanks. No go. Tried making a + shaped male to fit into the female out of wood and turn with vice grips. Broke the wood. So is there a special tool to loosen this port? (pic is of holding tank, not water tank, but it has the same inspection port)

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Move with care or break the cap.

2 or 4 hands is good, but sometimes not enough (getting a stronger person can help).

Another option is 2 things to fit (snugly) into the ends of the + shape then use a bar across them and extending out one end,

for example a socket wrench with a long handle and a pipe (socket extension piece): socket fits in the +, long handle lies across the port, small pipe fits into other end of + and rubs against the socket handle, handle lies across red thingy and sticks out (a lot) one end.

Be cautious of banging knuckles when it lets go.

When you get it out ... clean both threads really carefully (toothbrush) ... any grit in the thread does not help for tightening or next time.

Kingsley

L470, Sydney, Pittwater.

When I asked the dealer he said Lagoon has one but I never could figure out how to get it.

Attached is the tool I made. Also good for removing mud from the anchor. ;-) I didn't bother making it a "+", as "l" worked just fine. The notch helps me get it level, as ours port was flush with the tank and then a long handle for leverage.

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I bought an inexpensive metal dock cleat with two mounting holes and a solid base that was slightly wider than the groove in the cap. I ground the width of the base so it fit snuggly in the cap. ?The ears on the cleat serve as a solid hand hold for both hands to move the cap. ?If it is really stuck you can slip a pipe over the end of the cleat to add some leverage. ?Works on the holding tanks as well.

What a great solution!

Thanks for sharing!

Richard
REWIRED
Lagoon 40
now in Croatia

I had some PM's asking for some additional information on this tool. ?I purchased a metal 8" cleat and milled down (you could grind it) the foot so it was 11/16" wide.

Clever; I like it! Are the plates the same size as deck plates? If so I’ve seen these:?
And these:?

And I have a white plastic version that can extend for various widths bu I’m not near the boat and can’t recall where I found it.

LeeV
Corsair 36?Momentum (for sale)