BTW, Newmar has 5/8" that are used in building their rigs--no assortment, nor can they tell me where they buy them. Attached is a pix of my water inlet that I replaced because of a failed check valve. Disregard the male hose fitting. All the fittings are 5/8". The fitting which goes from the blue pex to the elbow elbow is a 5/8" PEX to 1/2" mpt. ALL the pinch clamps are 3/4" clamps- even the 2 on the blue pex. The number stamped on them is 23.3, which is the same as my bag of Sharkbite 3/4" clamps.
I have decided to use 2ea 3/4" x 5/8" couplers and a 3/4x 3/4 x 1/2" Tee and just plumb from the Tee to the accumulator tank with 1/2" pex. A little bit of a kludge--but it will work. Both Lowes & Home Depot have the parts--the couplers will be shipped free to store.
Picked up 1/14/2020-- 2020 BS 3226 w 24k chassis
SOLD--->2014 Nexus Viper 29V Class B+ downsized from a 2008 Allegro Bay 35TSB
Towed is 2007 Ranger with shell