When TPI built
offshore sailing vessels for the US
Navy, the
head chosen by the
Navy was the Wilcox and Crittenden
Skipper solid
bronze 4” head. It could pump manatee biscuits all day.
No longer available unless your crew needs this head and you have to
rebuild...the next best choice is the Groco.
Plastic heads, kitty litter ( desiccation / not exactly composting) boxes are perfectly compatible with toy plastic ( unsupported ball valves) Forespar products.
You get what you pay for.
Your “biscuit” volume may vary with your diet. Plastic bags do not compost thus the decision is up to you as to your disposal choices.
Let’s not kid anymore about plastic.
Happy transit time.
Captain Mark