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Boshart FIN1436-211 1" Insert x 1-1/2" MPT Poly Pipe Adapter
The Boshart FIN1436-211 is a 1" insert x 1-1/2" MPT adapter fitting designed to transition polyethylene (poly) tubing to male-threaded pipe or fittings in rough-in water system installations. This reducing insert-to-threaded configuration lets contractors and installers step a smaller-diameter poly line up to a larger threaded connection point, such as a pump, tank, or valve, without cutting in a separate reducer and coupling. As a purpose-built transition adapter, it is intended for behind-the-wall, underground, or well/water-system rough-in work rather than finished, visible plumbing.
Key Features
- Trade Size: 1" insert connection on one end transitioning to 1-1/2" MPT (male pipe thread) on the other, allowing a size step-up between poly tubing and a larger threaded connection.
- Insert x MPT Configuration: One end is sized for insertion into 1" poly pipe/tubing and is intended to be secured with a stainless steel clamp; the opposite end is a standard male pipe thread for connecting into female-threaded fittings, valves, tanks, or pumps.
- Reducing Transition Fitting: Purpose-built to bridge two different pipe/tube diameters and connection styles (insert to threaded) in a single fitting, simplifying rough-in runs where poly tubing meets threaded equipment.
- Rough-In Application: Designed for use in well systems, water service lines, and other buried or concealed poly-pipe installations where a threaded transition point is required.
Technical Specifications
- Insert Size: 1"
- Threaded Size: 1-1/2" MPT
- Model/SKU: FIN1436-211
Typical Applications
- Well and Water System Rough-In
- Poly Pipe to Threaded Fitting Transitions
- Underground and Concealed Water Line Installations
- Pump, Tank, and Valve Connection Points
- New Construction and Well System Retrofits
Why Boshart?
Boshart specializes in water system and well fittings built for reliable rough-in performance behind the wall and underground. The FIN1436-211 insert x MPT adapter gives installers a straightforward way to transition poly tubing to a threaded connection in a single fitting, helping streamline installation on well and water service lines. Choose Boshart for rough-in plumbing components engineered for the demands of professional installation work.
Manufacturer Resources
Product Specs
- list_batch:
- BOS-20260923
- Product Type:
- Insert x MPT Adapter
- Connection Type:
- Insert x Threaded (MPT)
- Department:
- Plumbing
- Product Subgroup:
- Fittings and Valves
- Product Size:
- 1" x 1-1/2"
- Product Group:
- Fitting
Boshart FIN1436-211 – Frequently Asked Questions
1) Will the Boshart FIN1436-211 connect 1 inch poly pipe to a 1-1/2 inch female threaded pump or tank port?
That's exactly what it does. The FIN1436-211 has a 1 inch insert barb on one end that goes inside 1 inch polyethylene tubing, and a 1-1/2 inch male pipe thread on the other for threading into a female-threaded pump, tank, valve, or fitting. The size step happens inside the single fitting, so you don't need a separate reducing coupling in the run.
2) Do I need a clamp on the insert end of this poly pipe adapter?
Yes. The 1 inch insert end is meant to be pushed into the poly tubing and secured with a stainless steel clamp, which is not part of the fitting. Plan on one clamp per insert joint (many installers double-clamp on buried well lines). The 1-1/2 inch MPT end needs thread sealant or PTFE tape instead.
3) Is this Boshart insert adapter suitable for exposed finished plumbing under a sink?
No. The FIN1436-211 is a rough-in transition fitting for well systems, water service lines, and buried or concealed poly runs. It's built for behind-the-wall, underground, and equipment connection points, not for finished, visible plumbing where you'd want a chrome or brass supply fitting.
4) Can I use a male insert adapter like this instead of a reducer plus a coupling at the pump?
Yes, and that's the point of the reducing configuration. Stepping 1 inch poly up to a 1-1/2 inch male thread in one body removes two joints from the run, which means fewer leak paths on a buried or concealed line. The alternative, a 1 inch insert x 1 inch MPT adapter followed by a 1 x 1-1/2 bushing, does the same job with more fittings.
5) What is the exact Boshart part number for the 1 inch insert x 1-1/2 inch MPT adapter?
Boshart FIN1436-211. Order by that number, since the FIN1436 family covers several insert-to-MPT size combinations and only the -211 is the 1 inch insert x 1-1/2 inch male pipe thread version.
6) Where would a well contractor actually use this adapter on a job?
Typical spots are the discharge side of a jet or centrifugal pump, a pressure tank tee, or a valve body where the equipment port is 1-1/2 inch female thread and the service line leaving it is 1 inch poly. It also gets used on water service lines and well system retrofits where an existing threaded connection has to pick up a poly run.
How fast can I get the Boshart FIN1436-211 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
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Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Boshart FIN1436-211 come with a warranty?
Absolutely. The Boshart FIN1436-211 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Boshart FIN1436-211?
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