| Number of Outlets: | 4 |
|---|---|
| Loop Size: | 1/2" |
| Supply Connection: | PEX |
| Supply Size: | 3/4" |
| Material: | Engineered Plastic |
| Fitting System Compatibility: | Expansion PEX |
| Tubing Compatibility: | PEX |
| Max Temp (F): | 210°F at 150 psi |
| Standards Met: | ASTM F1960 ASTM F877 CAN/CSA B137.5 |
| Max. Manifold Flow: | 3.75 gpm @ 4 fps 7.5 gpm @ 8 fps |

See the submittal sheet linked below: http://s3.supplyhouse.com/manuals/1309292377887/57035_PROD_FILE.pdf
Yes, the flow through end is 3/4". It can be used as an additional outlet.
No they do not, the loop sizes are 1/2"
no, 1" and 3/4", the 4 loops are 1/2", 5 outlets if you included the main thru.