Mike,
I have a 2001 420.... Had the service guys at Norton's install a deck/anchor washdown pump for me when I bought the boat. It's an easy installation:The (Groco) Pump is mounted on the bulkhead (in the locker under fwd bunk) opposite the massarator pump. Because of the substantial volumn of water the pump delivers they advised (and installed) a separate, dedicated thru hull (located next to massarator thru-hull)....Power was teeded from wiring for anchor windless, and on/off switch was installed in fwd head above and to the right of mirror cabinet.. Output hose was run from pump thru space adjacent to anchor windless wiring to area behind anchor locker just below windless 'up/down' switches, where a hole was drilled, and hose fitting and on/off valve installed. I use an 8' length of garden hose (w/ nozzle)attached to the valve. Works great... delivers excellent pressure thru the nozzle to wash chain, anchor, etc. (Outranges most watergun opponents.... .)In my opinion, the volumns of water used to wash anchor, chain, bow pulpit, etc. would make fresh water wash-down impractical...Also, since there is a drain at the bottom of the anchor locker, I have had no odor problem; but then, I do not use nylon rode, I use a 250' 5/16" all chain rode; and put a plywood 'false floor' (w/ holes in it), in the anchor locker, to keep the chain from lying all the way down in the (dirty) bottom of the locker. If you plan to anchor even occasionally it makes the entire experience much nicer