Garden-Plumbing Workhorse: BSP to 3/4 Hose Barb
Created today
Description
A straight-line adapter that bridges a 1-1/4" BSP female threaded socket to a 3/4" hose barb, with a tapered shoulder carrying the eye from the wide threaded end down to the narrow ridged nozzle. It reads like a piece of honest utility hardware: a ring of 11 TPI thread at one end, three crisp ridges at the other, and a 15 mm bore running clean through a compact 55 mm body — short enough to tuck into tight pump and tap arrangements without a loop of hose fighting for room.
The barb's ridges ramp up gently from the tip and widen toward the body, then drop off in a sharp step — the hose slides on without a fight, and the step keeps it from backing off again.
Design notes:
- 1-1/4" BSP female socket, 11 TPI, 41.91 mm major diameter, 18 mm deep
- Tapered transition from the socket down to the barb
- 19 mm barb with three retention ridges, 7 mm tall and spaced 8 mm apart, narrow at the tip and widening to a step at the body side, for 3/4" hose
- 15 mm bore through the full length; 55 mm overall
- Prints as a single piece, sitting upright at roughly 50 × 50 mm on the plate
Fit and sealing:
- The thread is modelled at nominal size with no added clearance, so a first test fit against the male fitting is worth doing — if it binds, opening it out by 0.2–0.4 mm is the easy fix.
- For a watertight joint, wrap the thread with PTFE tape or seat a flat washer against the socket floor.
- The shortened barb leaves less hose length to grip; a hose clip just behind the final ridge makes up for it.
Pairs naturally with garden hose, pump outlets and tank fittings.
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