-4AN 90-Degree Oil Feed Fitting for Use at Oil Filter Housing

These fittings are used with one of our stainless braided oil feed line kits that is fed from the oil filter housing. They are designed to thread into a port at the oil filter housing (with either 3/8 NPT or 3/8 BSPT thread) and present a -4AN male thread that can then be attached to a -4AN oil line. Available in an unrestricted version, or modified to accept restrictor plugs.

NOTE: Photo is for display purposes and depicts an NPT fitting and a BSPT fitting.  Be assured that your order will correspond to your selections in the drop-downs.

NOTE: Our restrictor plugs will work ONLY with an RTM restricted fitting.  This is due to the fact that an unrestricted fitting will not be modified with an internal thread to accommodate a restrictor plug. In addition, since the internal dimensions of the fittings differ between our NPT and BSPT fittings, the restrictor plugs CANNOT be interchanged bewteen NPT and BSPT fittings.  Furthermore, RTM's restrictor plugs will work only with an RTM fitting, not other manufacturers' fittings.  The reverse is also true: another manufacturers' restrictor plug will not work with an RTM fitting.

NOTES on BSPT FITTING: We're going to let you in on a secret: the oil ports on a DSM oil filter housing are NOT 3/8 NPT, they're actually 3/8 BSPT (British Standard Pipe Taper). BSPT and NPT are VERY close in size and thread pitch but they are NOT interchangable. That's not to say NPT can't be made to work. It can. It does so by deforming the female threads to match the male threads (this is especially true when the male thread is a harder material than the female (steel vs. aluminum in this case)). But the facts are undeniable: the oil port is 3/8 BSPT female and ONLY a BSPT male fitting is a CORRECT match. We're not going to preach about how you absolutely should use BSPT and that anything else is "hack". RTM has offered in the past and will continue to offer its oil feed kits in an NPT version (so does virtually every vendor we're aware of). We would just like our customers to know the facts and let them make their own choice. By the way, we do NOT recommend switching between NPT and BSPT. That is, if you're already running an NPT fitting in your filter housing, we do NOT recommend you switch to BSPT. This is due to the fact that your oil port will have already "deformed itself" to match NPT and the chances of it re-deforming to match BSPT are greatly diminished. A BSPT fitting should only be threaded into an unmolested BSPT port.

NOTES for CUSTOM RESTRICTOR FITTING: The restrictor is inside the 3/8 BSPT or NPT fitting that threads into the filter housing port. The restrictor is available in several sizes or we can even custom drill the restrictor to virtually any size you want. To choose a custom restrictor size, choose "custom size" from the restrictor size list in the drop-down menu below. Then, when you go thru the checkout procedure with your order, put the size restrictor you want in the "Customer Notes" box. 

Several purchase options available.
Choose from drop-downs below: