Th microscope a cup of barbed fittings for poly pipe collateral radiator reference
Amazon.com: Brass Hose Barb Reducer, 3/8" to 5/16" Barb Hose ID, Reducing Barb Brabed Fittings Splicer Mender Union Air Gas Water Fuel Line Heater Garden Pond Poly Tubing Adapter (Pack of 2) :
Proline Series 1-1/2-in x 1-1/2-in Barbed Barb x Mip Adapter Fitting in the Brass Fittings department at Lowes.com
3/4" FPT X 3/4" HOSE BARB ELBOW - 90 POLY
Banjo Poly 1 1/2 in. NPT x 1 1/2 in. Straight Hose Barb - John M. Ellsworth Co. Inc.
BANJO HBT200 2" POLY HOSE BARB TEE, 2" X 2" X 2" HB