Hose splice · 4 in
POWERTEC 70123V hose connector
The part that makes two short hoses into one long one — tapered at both ends so it goes in without a fight.
Every figure below names its source. Each one is a manufacturer
specification read off the listing itself. The judgments are ours.
Tapered at both ends
Corrugated hose is stiff, and a straight spigot has to be forced into it — in a
cold shop that means a hot-air gun or a great deal of swearing.
A tapered port enters easily and tightens as it goes, so the joint seats square
instead of oval.
Four of the five POWERTEC fittings on this shelf publish a taper. The Fulton
blast gates here publish one on both sides and name the same reason.
It is a detail that matters once, at assembly, and that is when it matters.
A raised middle
The listing names both jobs: easier assembly, and grip.
A smooth sleeve can be pushed too far, leaving one hose with all the overlap and
the other with none. A raised band stops each hose at the same depth.
And it gives a thumb something to push against.
Nothing else on either half of this shelf publishes a stop on a splice.
Why nominal is not a measurement
A four-inch fitting is not four inches anywhere on it.
The POWERTEC listings on this shelf publish the actual figures: a four-inch
nominal end measures 3-31/32 in across the outside and 3-39/64 in across the
inside — 100.8 mm (3.97 in) and 91.7 mm (3.61 in). The difference between those two is the wall, and
the difference between one maker’s outside and another’s inside is the leak.
That is what the shelf’s own intro means by the adaptors that never quite fit.
Nominal sizing is a naming convention; the join is decided by the sixty-fourths.
Hose to hose, and nothing else
Both ends of this part are male spigots at 3-31/32 in across.
So it joins two hoses. It will not go on a machine port, and it will not go on a
duct — for those, the 70125 adapter on this shelf has one end of each kind.
Two clamps are needed. Neither is in the box.
Availability
Read on the day this page was built: $10 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Prices quoted in this text were read on 2026-10-07. The live price is at the top of the page.
