My boat has a TMC electric heads and I'm looking for a wrap around holding tank as per the photo below.
Anyone know the brand or where you can get these from?

Not to sure on that tank but plastimo do a similar one, try searching plastimo 25 lt buffertank for toilet.
Thanks for the lead and educating me on buffer tanks. I may go with a tek 40L vertical waste tank instead.
It's an Osculati Black Water Tank 26L
Mfg part number appears to be 50.144.25
marineparts.ie/universal-waste-water-collection-tank/
www.ebay.com.au/itm/134242615768?srsltid=AfmBOorVIOO-LFMPk2gIfe810Y--4i9G8pKpDBZwHhdnzrFvsVa1Bb3B
A company called Australian Boating Supplies claims a relationship with them but doesn't list the item in stock.
austboating.com.au/osculati/?srsltid=AfmBOopL4uhKaB-G4ZDpmN39v2oawT7Z41IRKs_ePWV8Pc7U1hyfhwqF
Thanks for the lead and educating me on buffer tanks. I may go with a tek 40L vertical waste tank instead.
Good to have a bulhead mounted above WL tank for easy offshore discharge.
I have a Vetus 60 litre. Its got a nice shape V bottom and outlet for a complete pump out.
Size depends on POB & how many days you expect between emptying.
Thank you for the information above. I have some alternatives and I will go with whatever I can make fit. I agree a gravity waste offshore is the way to go if I can make it work.