NOTE the 4way varient is currently out of stock and will be available again 3rd week in October 2026. 
The O.E part seems to have dried up(?:-))apparantly the tooling is not serviceable anymore.. so this MS designed aluminum part CNC machined and anodised for corrosion protection will replace and outlast the equivalent plastic item.
The problem seems that with time (these could be some 20+ years old!) the plastic becomes brittle and the smaller diameter pipe snaps and can cause a total coolant loss. The end result doesn't bear thinking about.
Replace with this inexpensive  CNC machined quality new part for peace of mind..before the inevitable happens!! Limited quantities have been made so get one before they're gone! I've made another batch of these as they were sold out! Latest batch are silver anodised. Same quality !!
There is a 3 pipe and 4 pipe variant. please select the option. Pictures shows the 4 way connector. PEO000010 The 4 way ones (with PRT stat) were used on the early TF's and the 3 way one PER000150 was used on the later cars and LE 500's.Check which one you have before ordering. 
Last photo shows the 3 way installed.
Review.
 Excellent product and service as always. Thanks Mike.