I bought the whole lot, not fitted yet. From my post in PBO forum:
My Volvo Penta MD22 (Perkins Prima M50) lift pump is 1/2" UNF. This was my shopping list ...
... It seems that 5/16" and 8mm are interchangeable.
8992 5/16" x 10 mm o.d. hose nozzle £2.54
8992 8 mm x 10 mm o.d. hose nozzle £2.54
http://www.bes.co.uk/products/071.aspThey may do the other fittings I need as well, I will scratchpad them here for the moment.
Tank: 8mm compression to 10mm hose nozzle x2 >>> BES 8992 as above ✓
Filter: 1/4"-18 NPTF male to 10mm (3/8") hose nozzle x2 >>> ASAP HOSE TAIL RACOR 1/4"NPT TO 3/8" HOSE 301953 ✓
Pump and return: 1/2" UNF male to 10mm hose nozzle x2 >>> eBay item number:271285361416 ✓
Tap: BALL VALVE 3/8 BSP FEMALE TEE HANDLE ASAP Part No. 405202 TBO
Tap: 3/8 BSP M/F elbow x2 eBay 111196757689 ✓
Tap: 3/8 BSP M hose nozzle x2 eBay 111269900680 ✓
Mini Hose Clips (or Clamps) rather than Jubilee Clips, better with small diameter hose.