AquaLock„¢ Fittings can be connected to: Copper, CPVC, PEX, LDPE, MDPE, HDPE and Polypropylene tubing.

POLYPROPYLENE TUBING SIZE OUTSIDE DIAMETER [OD]	COPPER TUBE SIZE INSIDE DIAMETER [ID]
3/8" OD	1/4" CTS
1/2" OD	3/8" CTS
5/8" OD	1/2" CTS
7/8" OD	3/4" CTS
1-1/8" OD	1" CTS

CTS = Copper tube size
NPT = National pipe tapered thread standard [MIP or FIP]
NPS = National pipe straight thread standard [IPS]
MGHT = Male garden hose thread

OD ACTUAL (INCHES)	PIPE THREAD SIZE (NATIONAL PIPE THREAD - NPT)
0.540	1/4" NPT
0.675	3/8" NPT
0.840	1/2" NPT
1.050	3/4" NPT
1.315	1" NPT
1.660	1-1/4" NPT
1.900	1-1/2" NPT
2.375	2" NPT

Union Tee

Watts AquaLock - Large Diameter Male Thread Union Tee