Flair-It
3/4 pex x 3/4 pex, elbow, for pex or polybutylene, on 3/4" polybutylene you must use a #26790 adapter.
Ipex PVC SCH 40 Reducing Pipe Adapter Slip x MPT
Lasco Fittings Reducing Male Adapter
Lasco Fittings PVC 45 Degree Elbow Slip By Slip
Lasco Fittings PVC Reducing Bushing Spigot By FIP
Charlotte Pipe Low-Lead Male Adapter Brass MPT x CTS Socket (1/2")